All practice questions

Question 12541Question →

A surveyor conducting a prismatic compass traverse along stations $P$ , $Q$ , $R$ , and $S$ records the following observed bearings:

- Line $P-Q$ : Forward Bearing $= 142^\circ 00'$ , Back Bearing $= 322^\circ 00'$
- Line $Q-R$ : Forward Bearing $= 075^\circ 30'$ , Back Bearing $= 258^\circ 00'$
- Line $R-S$ : Forward Bearing $= 190^\circ 00'$

If the local magnetic declination in the survey area is $5^\circ 30'\text{ W}$ , what is the true geographic forward bearing of line $R-S$ ?

182^\circ 00'

184^\circ 30'

187^\circ 00'

193^\circ 00'

Show answer & explanation

Answer: $182^\circ 00'$

Answer

The true geographic forward bearing of line R-S is

182^\circ 00'

.

The correct answer is

182^\circ 00'

. Evaluating line P-Q shows a difference of exactly

180^\circ 00'

between its forward bearing (

142^\circ 00'

) and back bearing (

322^\circ 00'

), confirming that stations P and Q are free from local attraction. Consequently, the forward bearing of line Q-R (

075^\circ 30'

) measured at station Q is accurate, making its theoretical back bearing at station R equal to

075^\circ 30' + 180^\circ 00' = 255^\circ 30'

. Comparing this with the observed back bearing at station R (

258^\circ 00'

) identifies a local attraction error of

+2^\circ 30'

at station R. Applying this correction to the observed forward bearing of line R-S (

190^\circ 00'

) gives a corrected magnetic bearing of

187^\circ 30'

. Finally, subtracting the

5^\circ 30'\text{ W}

magnetic declination (

\text{True Bearing} = \text{Magnetic Bearing} - \text{West Declination}

) yields

182^\circ 00'

.

Step-by-Step Solution

1

Identify stations free from local attraction

Difference for line P-Q

= 322^\circ 00' - 142^\circ 00' = 180^\circ 00'

. Both station P and station Q are free from local attraction.

When the difference between the forward bearing and back bearing of a line is exactly

180^\circ

, neither instrument station suffers from local attraction.

2

Determine local attraction at station R

Since station Q is correct, the true magnetic forward bearing of Q-R is

075^\circ 30'

. The correct back bearing at station R should be

075^\circ 30' + 180^\circ 00' = 255^\circ 30'

. The observed back bearing at station R is

258^\circ 00'

. Local attraction at station R

= 258^\circ 00' - 255^\circ 30' = +2^\circ 30'

.

Any bearing taken FROM station R reads

2^\circ 30'

too high due to local magnetic interference.

3

Calculate corrected magnetic forward bearing of line R-S

Corrected Magnetic FB

= 190^\circ 00' - 2^\circ 30' = 187^\circ 30'

.

Subtracting the positive local attraction error adjusts the reading to the correct magnetic orientation.

4

Convert magnetic bearing to true geographic bearing

True Geographic Bearing

= \text{Magnetic Bearing} - \text{West Declination} = 187^\circ 30' - 5^\circ 30' = 182^\circ 00'

.

When magnetic declination is West, True Bearing equals Magnetic Bearing minus Declination (

\text{TB} = \text{MB} - \text{W}

).

Key Concept

Correction of Prismatic Compass Bearings for Local Attraction and Magnetic Declination

Estimated Time:2m 0s

Question 12542Question →

Match each specific landform of coastal erosion on a rocky shoreline with its defining geomorphic description.

Click a left item, then click its matching right item

Show answer & explanation

Answer

Geo matches the narrow steep-sided inlet formed by cave roof collapse; Blowhole matches the vertical shaft connecting a cave to the cliff top; Wave-cut platform matches the gently sloping exposed rock bench left by cliff retreat; Wave-cut notch matches the indentation carved into the base of the cliff.

The pairings correctly reflect the geomorphic development of erosional coastlines: a geo is an open narrow inlet formed by complete cave roof collapse; a blowhole is a vertical pipe opened by air trapped under wave pressure; a wave-cut platform is a exposed rocky shore bench; and a wave-cut notch is the groove eroded into a cliff base at sea level.

Step-by-Step Solution

1

Analyze the landforms associated with the marine erosion of rocky cliff coastlines.

Identify geo, blowhole, wave-cut platform, and wave-cut notch as distinct structural outcomes of wave action.

Each feature corresponds to a specific mechanism of hydraulic action, abrasion, and structural collapse along joint lines.

2

Match each landform to its physical mechanism and morphological characteristic.

Link Geo to roof collapse inlet, Blowhole to vertical compressed-air shaft, Wave-cut platform to eroded intertidal rock bench, and Wave-cut notch to cliff base undercutting.

Correctly matching definitions ensures understanding of the sequence of cliff retreat and cave development.

Key Concept

Erosional Coastal Processes and Landforms

Question 12543Question →

Unlike the Ajaokuta Steel Plant located near the Itakpe iron ore deposits in Kogi State, the Delta Steel Company at Aladja near Warri was established far from inland iron ore fields. Which primary geographical factor determined the industrial siting of the Aladja steel plant?

Proximity to extensive coking coal deposits located within the immediate coastal swamp zone of Delta State

Availability of natural gas from Niger Delta oilfields for direct reduction smelting and coastal port access for importing iron ore pellets

Strict market orientation dictated by the heavy weight-gaining character of primary steel smelting

Dependence on surrounding agricultural forest reserves to supply hardwood charcoal for blast furnace fuel

Show answer & explanation

Answer: Availability of natural gas from Niger Delta oilfields for direct reduction smelting and coastal port access for importing iron ore pellets

Answer

The siting of the Delta Steel Company at Aladja was primarily determined by proximity to Niger Delta natural gas fields used in the direct reduction steelmaking process and access to coastal water transport facilities.

The Delta Steel Company at Aladja (Warri) was sited specifically to take advantage of abundant natural gas reserves in the Niger Delta, which fuel the Direct Reduction (DR) process of steelmaking. Additionally, its coastal location near Escravos and Warri port channels facilitates maritime transportation of imported iron ore and output distribution.

Step-by-Step Solution

1

Analyze the technological requirements of the Delta Steel Company at Aladja compared to traditional blast furnace plants.

Aladja uses Direct Reduction (DR) technology rather than the traditional blast furnace system used at Ajaokuta.

Direct reduction technology requires large volumes of natural gas as a reducing agent and power source instead of coking coal.

2

Identify the geographical advantages provided by the Niger Delta coastal location.

The location offers immediate access to natural gas pipelines from oilfield gas flaring/processing units and port infrastructure along the Warri river channel.

Natural gas fuels the reduction process, while river ports allow transshipment of imported iron ore pellets and heavy equipment.

3

Evaluate why alternative location factors such as market or coal proximity are secondary or inaccurate.

Steelmaking is a weight-losing manufacturing operation, and Nigeria's major coal reserves lie inland (Enugu/Middle Belt), making coastal gas resources the decisive location advantage.

Weberian industrial location principles dictate placing weight-losing or energy-intensive industries near fuel supply nodes when raw materials must be transported.

Key Concept

Industrial Location Factors for Energy-Intensive Metallurgical Manufacturing in Nigeria

Estimated Time:2m 0s

Question 12544Question →

Nigeria extends from the coastal waters of the Gulf of Guinea in the south to the semi-arid region near Lake Chad in the north. Which pair of parallels of latitude defines the precise southern and northern limits of the country?

4^\circ\text{N}

and

14^\circ\text{N}

3^\circ\text{E}

and

15^\circ\text{E}

4^\circ\text{S}

and

14^\circ\text{S}

3^\circ\text{N}

and

15^\circ\text{N}

Show answer & explanation

Answer: $4^\circ\text{N}$ and $14^\circ\text{N}$

Answer

4^\circ\text{N}

and

14^\circ\text{N}

Nigeria is situated in West Africa between parallels of latitude

4^\circ\text{N}

and

14^\circ\text{N}

, giving the country a total north-south angular span of

10^\circ

.

Step-by-Step Solution

1

Identify the geographical extent of Nigeria along the north-south latitudinal axis.

The coastal southernmost border lies at latitude

4^\circ\text{N}

, while the northern boundary reaches latitude

14^\circ\text{N}

.

Latitude measures angular distance north or south of the Equator (

0^\circ

).

2

Distinguish latitudinal boundaries from longitudinal boundaries.

Nigeria's latitudinal range is

4^\circ\text{N}

to

14^\circ\text{N}

, whereas its longitudinal range is

3^\circ\text{E}

to

15^\circ\text{E}

.

Interchanging latitudinal and longitudinal coordinates is a common error when learning regional location facts.

Key Concept

Latitudinal Extent of Nigeria

Question 12545Question →

In East Africa, the volcanic highlands of Rwanda, Burundi, and the Kenyan Rift Valley support some of the highest rural population densities on the continent, often exceeding $400$ persons per square kilometer. Which combination of geographic factors is primarily responsible for sustaining these exceptionally high rural population concentrations?

Fertile volcanic soils, reliable relief rainfall, and reduced incidence of highland malaria due to lower temperatures

Severe drought and soil degradation in surrounding lowlands acting as push factors that concentrate rural dwellers into nucleated industrial centers

Flat relief allowing large-scale mechanized monoculture with low labor intensity per unit area

An inverted demographic dependency ratio caused by the massive in-migration of non-working elderly populations into farming areas

Show answer & explanation

Answer: Fertile volcanic soils, reliable relief rainfall, and reduced incidence of highland malaria due to lower temperatures

Answer

Fertile volcanic soils, reliable relief rainfall, and reduced incidence of highland malaria due to lower temperatures

The combination of nutrient-rich volcanic soils, abundant relief rainfall, and high elevation (which suppresses malaria vector survival) creates an exceptionally high environmental carrying capacity, enabling intensive smallholder agriculture that sustains high rural population densities.

Step-by-Step Solution

1

Identify the physical geographic characteristics of the East African highlands.

The region features elevated relief, recent volcanic geology, and an equatorial highland climate.

Physical controls determine the basic agricultural carrying capacity and health environment of a region.

2

Analyze how these physical characteristics impact population carrying capacity.

Volcanic parent materials produce highly fertile soils (andosols), mountain barriers induce reliable relief rainfall, and high altitude lowers ambient temperatures below the optimal threshold for malaria-transmitting Anopheles mosquitoes.

High soil fertility combined with adequate moisture and reduced disease burden allows continuous intensive smallholder farming.

3

Evaluate and eliminate incorrect human and demographic explanations.

High rural density is driven by environmental carrying capacity and agricultural productivity, not by lowland push factors, flatland mechanized farming, or elderly migration.

Distinguishing environmental controls of rural density from urban migration drivers reveals the correct geographic factors.

Key Concept

Physical Controls of Rural Population Density in Africa

Estimated Time:2m 0s

Question 12546Question →

In population geography, migration flows are driven by diverse environmental, economic, and social forces that generate distinct demographic consequences. Match each migration scenario on the left with its corresponding migration driver or primary socio-economic effect on the right.

Click a left item, then click its matching right item

Show answer & explanation

Answer

Severe desertification in the Sahel matches Environmental push factor; Rapid industrial expansion in coastal cities matches Economic pull factor; Emigration of healthcare professionals matches International brain drain; Seasonal movement of pastoralists matches Transhumance.

Each migration scenario correctly aligns with its primary driver or demographic classification: ecological land degradation acts as an environmental push factor; urban employment growth functions as an economic pull factor; specialized professional emigration creates a brain drain; and seasonal herding along defined ecological routes is termed transhumance.

Step-by-Step Solution

1

Analyze environmental push factors

Drought and land degradation force populations to leave degraded origin regions, categorizing Sahelian desertification as an environmental push factor.

Push factors originate from unfavorable conditions at the place of origin.

2

Identify economic pull drivers

Concentrations of industrial jobs draw labor toward metropolitan areas, making urban employment expansion an economic pull factor.

Pull factors attract migrants to destination areas offering improved economic opportunities.

3

Evaluate skilled international migration consequences

The outflow of highly specialized manpower abroad constitutes brain drain.

Brain drain specifically describes the loss of educated or professional human capital overseas.

4

Classify seasonal livestock mobility

Cyclical movement aligned with wet and dry seasons is classified as transhumance.

Transhumance is defined by traditional pastoral routes tied to seasonal rainfall patterns.

Key Concept

Population Migration Drivers, Typologies, and Demographic Consequences

Question 12547Question →

The Eastern Scarplands of Nigeria, stretching from Nsukka through Enugu to Okigwe, present a prominent cuesta landscape. Which of the following correctly describes the structural relief and drainage characteristics of this physical region?

A steep eastward-facing scarp slope drained by headstreams of the Cross River and a gentle westward dip slope drained by tributaries of the Anambra River

A radial drainage network of braided streams radiating outward from a central volcanic caldera down basaltic lava plateaus

An endorheic drainage basin where short seasonal streams flow inward into localized salt lakes without reaching coastal outlets

A broad alluvial plain dominated by expansive river terraces and oxbow lakes discharging northward into the Benue River

Show answer & explanation

Answer: A steep eastward-facing scarp slope drained by headstreams of the Cross River and a gentle westward dip slope drained by tributaries of the Anambra River

Answer

A steep eastward-facing scarp slope drained by headstreams of the Cross River and a gentle westward dip slope drained by tributaries of the Anambra River

The Eastern Scarplands of Southeastern Nigeria represent a classic cuesta formed by tilted sedimentary strata. The asymmetric ridge features a steep scarp slope facing east (drained by short headstreams of the Cross River) and a long, gentle dip slope facing west (drained by tributaries of the Anambra River, which flows into the Lower Niger).

Step-by-Step Solution

1

Identify the geological structure of the Eastern Scarplands

The Nsukka-Enugu-Okigwe ridge is composed of inclined sedimentary sandstone and shale beds forming a classic cuesta landform.

Unequal erosion of tilted strata creates an asymmetric relief feature with two distinct slope faces.

2

Determine the orientation of the physical slopes

The steep escarpment faces east, while the gentle dip slope inclines westwards.

The westward dipping Cretaceous rock layers produce a sharp eastern drop-off and a gradually sloping western surface.

3

Relate the physical slopes to the regional river drainage pattern

Short, rapid streams flow down the eastern scarp into the Cross River basin, while longer streams flow down the western dip slope into the Anambra River.

Drainage systems align directly with the structural slopes of the cuesta landscape.

Key Concept

Cuesta relief structure and drainage alignment of the Eastern Scarplands

Estimated Time:1m 15s

Question 12548Question →

Which of the following short-term financial instruments is issued by the central bank on behalf of the government to raise funds for periods usually not exceeding one year?

Debentures

Treasury bills

Ordinary shares

Development stocks

Show answer & explanation

Answer: Treasury bills

Answer

Treasury bills

Treasury bills are short-term money market debt instruments issued by the central bank on behalf of the government to raise short-term funds maturing within 91 to 364 days.

Step-by-Step Solution

1

Identify the issuer and duration specified in the question stem.

The instrument is issued by the central bank on behalf of the government for a short-term period (up to 364 days).

Money market instruments cater exclusively to short-term borrowing and liquidity needs.

2

Distinguish between short-term money market instruments and long-term capital market securities.

Treasury bills are short-term money market debt instruments, whereas debentures, ordinary shares, and development stocks are long-term capital market instruments.

Treasury bills provide risk-free short-term financing to the government.

Key Concept

Treasury Bills as Money Market Instruments

Estimated Time:45s

Question 12549Question →

Match each slope measurement scenario on the left with its corresponding calculated gradient on the right.

Click a left item, then click its matching right item

Show answer & explanation

Answer

Vertical Interval = 80 m, HE = 1.6 km matches 1 in 20 (5%); VI = 150 m, HE = 600 m matches 1 in 4 (25%); VI = 50 m, HE = 2.5 km matches 1 in 50 (2%); VI = 200 m, HE = 1 km matches 1 in 5 (20%).

Each scenario is correctly matched by converting all horizontal distances into meters and calculating the simplified ratio VI / HE, expressed as both a ratio (1 in N) and a percentage.

Step-by-Step Solution

1

Convert all Horizontal Equivalent (HE) distances given in kilometers to meters so that units match the Vertical Interval (VI).

1.6\text{ km} = 1,600\text{ m}

,

2.5\text{ km} = 2,500\text{ m}

, and

1\text{ km} = 1,000\text{ m}

.

Both Vertical Interval and Horizontal Equivalent must be in the same units of measurement before calculating the ratio.

2

Apply the gradient formula

\text{Gradient} = \frac{\text{Vertical Interval (VI)}}{\text{Horizontal Equivalent (HE)}}

to each scenario.

Scenario 1:

\frac{80}{1600} = \frac{1}{20}

; Scenario 2:

\frac{150}{600} = \frac{1}{4}

; Scenario 3:

\frac{50}{2500} = \frac{1}{50}

; Scenario 4:

\frac{200}{1000} = \frac{1}{5}

.

Dividing vertical rise by horizontal distance yields the simplified slope fraction.

3

Express each simplified fraction in standard ratio (

1 \text{ in } N

) and percentage formats.

\frac{1}{20} = 1\text{ in } 20\ (5\%)

,

\frac{1}{4} = 1\text{ in } 4\ (25\%)

,

\frac{1}{50} = 1\text{ in } 50\ (2\%)

,

\frac{1}{5} = 1\text{ in } 5\ (20\%)

.

This allows matching the calculated values directly to the corresponding choices on the right.

Key Concept

Slope and gradient calculation using Vertical Interval (VI) and Horizontal Equivalent (HE) with unit unification.

Question 12550Question →

A topographical map extract drawn to a scale of $1 : 100,000$ shows a footbridge over a stream at an elevation of $250\text{ m}$ and a forest observation tower situated on a hilltop at an elevation contour of $450\text{ m}$ . If the straight-line distance between the bridge and the tower measured on the map is $4\text{ cm}$ , what is the average gradient of the slope between these two locations?

1\text{ in } 20

1\text{ in } 200

1\text{ in } 2000

1\text{ in } 8.9

Show answer & explanation

Answer: $1\text{ in } 20$

Answer

The gradient between the two points is

1\text{ in } 20

.

The gradient of a slope is computed as the Vertical Interval (VI) divided by the Horizontal Equivalent (HE). The vertical interval is

450\text{ m} - 250\text{ m} = 200\text{ m}

. Using the map scale of

1 : 100,000

, a map distance of

4\text{ cm}

equals

400,000\text{ cm}

or

4,000\text{ m}

on the ground. Dividing

200\text{ m}

by

4,000\text{ m}

simplifies to

\frac{1}{20}

, expressed as

1\text{ in } 20

.

Step-by-Step Solution

1

Calculate the Vertical Interval (VI)

\text{VI} = 450\text{ m} - 250\text{ m} = 200\text{ m}

Vertical interval is the difference in elevation between the two points.

2

Calculate the Horizontal Equivalent (HE) in meters

\text{HE} = 4\text{ cm} \times 100,000 = 400,000\text{ cm} = 4,000\text{ m}

Multiply map distance by the scale factor to get real-world distance, then convert centimeters to meters.

3

Calculate the slope gradient

\text{Gradient} = \frac{\text{VI}}{\text{HE}} = \frac{200\text{ m}}{4,000\text{ m}} = \frac{1}{20}

Gradient is expressed as the ratio of Vertical Interval to Horizontal Equivalent in identical measurement units.

Key Concept

Slope gradient determination using Vertical Interval (VI) and Horizontal Equivalent (HE)

Estimated Time:1m 30s

Question 12551Question →

Match each landform generated by running water or groundwater processes on the left with its precise formative geomorphic mechanism on the right.

Click a left item, then click its matching right item

Show answer & explanation

Answer

Polje matches with the massive, flat-floored karst depression formed by combined structural faulting and solutional planation. Braided stream channel matches with the network of shallow channels separated by alluvial bars created by excessive bed-load deposition. Natural levee matches with the elongated ridge of coarse sediment accumulated along river banks during overbank flooding. Uvala matches with the compound closed depression formed by the progressive coalescence of several sinkholes.

Each landform is paired precisely with its defining formative geomorphic mechanism based on standard physical geography. Poljes represent massive fault-assisted karst solution floors; braided channels stem from channel bed load choking; natural levees result from coarse sediment settling at flood margins; and uvalas form through compound sinkhole coalescence.

Step-by-Step Solution

1

Analyze karst surface depressions by scale and origin

Identify that dolines merge into uvalas, while the massive, structurally controlled karst depression with a flat floor is a polje.

Karst terrain landforms progress systematically from individual sinkholes to uvalas, culminating in structurally downfaulted poljes.

2

Evaluate fluvial depositional mechanisms in middle and lower river courses

Distinguish between channel-splitting alluvial bars (braided stream) and bank-building ridge deposits from overbank floods (natural levees).

Braiding occurs within the river bed due to load exceeding transport capacity, whereas levees build up along the stream margins during flood spillover.

3

Match each landform term directly to its precise process definition

Pair Polje to right_1, Braided stream channel to right_2, Natural levee to right_3, and Uvala to right_4.

Each feature corresponds strictly to its geomorphic definition in senior secondary fluvial and karst geography.

Key Concept

Classification and process attribution of surface fluvial depositional features and subterranean/surface karst solution landforms.

Question 12552Question →

Match each African agricultural system or development scheme with its corresponding environmental adaptation or operational characteristic.

Click a left item, then click its matching right item

Show answer & explanation

Answer

The Chitemene system matches with the slash-and-burn ash fertilization technique; Office du Niger matches with gravity-fed Niger Delta rice and sugarcane irrigation; Terraced agriculture in the Mandara Mountains matches with stone-walled contour farming for soil conservation; and Witwatersrand market gardening matches with intensive peri-urban farming supplying industrial centers.

Each agricultural system is accurately paired with its primary geographical adaptation: Chitemene utilizes woodland ash beds in Zambia; Office du Niger harnesses Niger River irrigation in Mali; Mandara Mountain agriculture uses stone terrace contours for slope management; and Witwatersrand market gardening supplies high-demand peri-urban industrial centers in South Africa.

Step-by-Step Solution

1

Analyze the traditional indigenous land-use system in Central Africa (Zambia).

Identify that Chitemene relies on pollarding trees and burning brush to create fertile ash spots in nutrient-poor miombo soils.

Ash fertilization is essential to reduce acidity and boost potassium and phosphorus levels for crop growth.

2

Evaluate the state-sponsored river basin irrigation development in West Africa (Mali).

Identify that the Office du Niger uses Niger River waters redirected via canals for paddy rice and sugarcane in the Sahelian zone.

Large-scale gravity canal networks bypass regional rainfall limitations to enable wetland farming.

3

Examine highland soil conservation strategies in West/Central Africa.

Identify that Mandara Mountain indigenous farming utilizes stone terraces built along steep contours.

Terracing reduces slope gradient, prevents topsoil erosion, and captures scarce runoff.

4

Determine commercial agricultural responses to dense urban and mining markets in Southern Africa.

Identify that Witwatersrand market gardening specializes in intensive, high-value perishable produce.

Proximity to large urban and industrial centers minimizes transport time and spoilage for dairy and fresh vegetables.

Key Concept

Classification and geographical analysis of African agricultural systems and irrigation schemes

Question 12553Question →

Match each distinct geographic region of Africa listed on the left with its corresponding population density driver or prevailing demographic migration pattern on the right.

Click a left item, then click its matching right item

Show answer & explanation

Answer

The Nile Valley and Delta matches high agricultural density via alluvial irrigation; the Copperbelt matches mineral resource extraction density; the Sahelian belt matches seasonal labor migration toward coastal regions; and the Namib and Sahara Deserts match hyper-sparse population distribution caused by extreme aridity.

Each region exhibits distinct spatial and demographic characteristics governed by physical environment and economic drivers. The Nile River Valley utilizes alluvial irrigation to support dense agricultural populations in an arid climate. The Copperbelt relies on mineral exploitation to form dense urban-industrial corridors. The Sahelian belt undergoes seasonal transhumance and economic migration toward coastal West Africa due to dry season environmental pressures. The Sahara and Namib Deserts exhibit hyper-sparse densities due to severe physical constraints on water supply.

Step-by-Step Solution

1

Analyze the physical and economic geography of the Nile River Valley.

Identified that rich silt and perennial irrigation create an agricultural oasis with extremely high population density despite surrounding desert.

Perennial river basins in arid zones concentrate farming populations.

2

Evaluate the primary human driver for population concentration in the Copperbelt region.

Recognized that copper and cobalt extraction acts as an industrial pull factor drawing dense urban settlements.

Mining activities create localized high population density independent of agricultural capability.

3

Determine the migration dynamics characteristic of the semi-arid Sahelian belt.

Linked environmental stress and distinct dry seasons to seasonal labor migration toward wetter, economically active coastal zones.

Climatic seasonality and economic disparities generate temporary labor mobility across West Africa.

4

Assess the environmental limits of the Namib and Sahara Deserts.

Matched physical extreme aridity with hyper-sparse population settlement.

Water availability acts as the fundamental limiting physical factor for human population distribution in Africa.

Key Concept

Physical and human factors controlling population distribution, density, and migration across African geographic zones

Question 12554Question →

Arrange the following stages of wave transformation in chronological order, from open water generation to its final arrival at the shoreline.

Drag items to arrange them in the correct order

Show answer & explanation

Answer

The correct sequence of wave movement is: initial wind generation in open water, followed by seabed friction in shallow water, followed by wave steepening, and concluding with wave breaking and swash movement up the shore.

Waves originate in open water through wind action. Upon entering shallow nearshore areas, friction with the seabed retards the base of the wave. The crest continues at high speed, steepening until it loses structural stability and breaks in the surf zone, driving swash up the beach slope.

Step-by-Step Solution

1

Identify the origin of marine wave energy.

Deep-water waves are formed far offshore by wind blowing over fetch area.

Wave creation must precede any coastal interaction.

2

Determine the impact of shallow water on wave motion.

As water depth becomes less than half the wavelength, wave base drags along the sea bottom.

Shoaling causes bottom friction which decreases wave velocity at the bottom.

3

Analyze structural change in wave profile.

Wave height increases, wavelength decreases, and crest steepens.

Top of wave moves faster than bottom due to bottom drag.

4

Pinpoint the final shoreline process.

Wave collapses forward in surf zone into swash.

Excessive steepness causes instability, breaking wave energy onto the beach slope.

Key Concept

Wave Shoaling and Breaking Mechanics

Question 12555Question →

Match each manufacturing industry scenario on the left with its corresponding location orientation principle according to industrial location theory on the right.

Click a left item, then click its matching right item

Show answer & explanation

Answer

Lime and limestone processing into cement pairs with raw material orientation due to weight loss; Commercial bakery pairs with market orientation driven by perishable weight gain; High-tech semiconductor assembly pairs with footloose orientation due to negligible transport costs; Heavy integrated iron and steel smelting pairs with break-of-bulk or resource junction orientation due to heavy multi-source inputs.

Each manufacturing industry locates according to its dominant cost factor: raw material weight-loss favors locating near inputs (cement), weight-gaining perishable products favor consumer markets (baking), high value-to-weight items are footloose (microchips), and multi-input heavy industries locate at transport/resource junctions (steel).

Step-by-Step Solution

1

Analyze material index and weight change for cement manufacturing

Cement production requires vast quantities of heavy limestone that loses weight during heating, indicating raw material orientation.

According to Weber's Material Index, if material index > 1 (weight losing), the industry locates at the raw material source.

2

Evaluate weight and perishability characteristics of bakeries

Bread increases in volume and spoils quickly, requiring immediate distribution, dictating market orientation.

Weight-gaining and perishable goods minimize total transfer costs by locating closest to consumer markets.

3

Examine transport cost weight of high-value microchips

Microchips are light and expensive, making transport costs negligible.

Footloose industries are spatially unconstrained by heavy raw materials or bulky market outputs.

4

Identify multi-resource assembly requirements for integrated steel production

Steel production aggregates iron ore, coal, and fluxing stone, favoring major transport nodes or resource junctions.

When multiple heavy inputs are needed, optimal sites balance total freight of incoming ores and outgoing products.

Key Concept

Industrial Location Factors and Weber's Material Index

Question 12556Question →

Match each environmental conservation technique listed on the left with its primary operational objective or environmental management function on the right.

Click a left item, then click its matching right item

Show answer & explanation

Answer

Terracing matches with mitigating surface runoff and soil erosion on steep slopes; Taungya system matches with integrating temporary crop farming with tree cultivation; Effluent treatment matches with neutralizing and purifying industrial wastewater before aquatic discharge; and Shelterbelts match with establishing tree rows to arrest desert encroachment and wind deflation.

Each technique targets a specific environmental problem: terracing combats water erosion on steep gradients by altering slope structure; the Taungya system promotes reforestation alongside temporary food production; effluent treatment purifies industrial liquid waste to protect water bodies; and shelterbelts function as windbreaks to halt desert encroachment in arid zones.

Step-by-Step Solution

1

Analyze mechanical slope conservation techniques.

Terracing constructs step-like benches across hillside gradients, effectively shortening the slope length and reducing surface runoff momentum.

This directly targets water-driven soil erosion on hilly agricultural terrains.

2

Evaluate integrated forest management strategies.

The Taungya system combines food crop farming with forestry plantation development during the early growth phase of young trees.

It aids in cost-effective afforestation while providing temporary land access for rural farmers.

3

Examine industrial pollution abatement measures.

Effluent treatment processes chemical and manufacturing wastewater to lower chemical oxygen demand (COD) and remove toxins.

This prevents severe water pollution and protects downstream aquatic organisms.

4

Identify biological measures for dryland wind erosion control.

Shelterbelts consist of rows of tall trees planted at right angles to wind currents in dry regions.

They disrupt wind energy, reducing soil detachment and stabilizing desert margins.

Key Concept

Classification and application of mechanical, biological, agroforestry, and industrial environmental conservation methods

Estimated Time:1m 30s

Question 12557Question →

In heavy industrial geography, the production of iron and steel involves a progressive reduction in material weight and an evolution in spatial location orientation. Arrange the following operational stages of iron and steel production in their correct sequential order, from initial raw material extraction to final consumer market distribution.

Drag items to arrange them in the correct order

Show answer & explanation

Answer

The correct order follows the spatial value chain of iron and steel manufacturing: raw material beneficiation at mine sites, primary smelting at raw material sources/ports, crude steel refining at transport junctions, and secondary fabrication near urban markets.

Industrial location spatial orientation shifts systematically along the manufacturing process. The first step is mine-site beneficiation to strip non-metallic waste (highest weight loss). The second step is primary blast-furnace smelting located near coalfields or break-of-bulk ports where heavy bulk inputs assemble. The third step is intermediate steel refining at regional transport junctions. The final step is market-oriented fabrication near urban consuming centers where product bulk increases.

Step-by-Step Solution

1

Identify the stage with the highest weight-loss ratio (raw material extraction site).

Beneficiation at the mine site removes useless rock (gangue), drastically reducing weight before bulk transport.

Processing raw materials at source prevents paying freight on useless waste matter.

2

Identify primary reduction/smelting location requirements.

Smelting crude ore into pig iron takes place at raw material sites or break-of-bulk ports.

Smelting consumes large inputs of fuel and ore, making primary reduction heavily raw-material and coalfield oriented.

3

Identify intermediate steelmaking and refining location.

Conversion of pig iron to crude steel occurs at integrated steelworks located at central transport nodes.

Transport junctions allow efficient assembly of pig iron and scrap metal while enabling regional distribution.

4

Identify final market-oriented manufacturing stage.

Secondary fabrication into finished consumer products takes place in proximity to major urban market centers.

Finished steel goods are bulkier, more expensive, and more fragile to transport than raw steel slabs, making market proximity essential.

Key Concept

Weight-loss ratios and spatial orientation shifts along the industrial production chain

Question 12558Question →

In 2007, the Federal Government of Nigeria enacted legislation establishing a new regulatory body to repeal and replace the Federal Environmental Protection Agency (FEPA). Which regulatory agency was created by this Act?

National Environmental Standards and Regulations Enforcement Agency

National Oil Spill Detection and Response Agency

National Emergency Management Agency

Federal Ministry of Water Resources

Show answer & explanation

Answer: National Environmental Standards and Regulations Enforcement Agency

Answer

National Environmental Standards and Regulations Enforcement Agency

The National Environmental Standards and Regulations Enforcement Agency (NESREA) was established by the NESREA Act of 2007, which repealed the Federal Environmental Protection Agency (FEPA) Act and vested broad regulatory and enforcement powers in NESREA.

Step-by-Step Solution

1

Identify the historical transition in Nigerian environmental regulation.

The Federal Environmental Protection Agency (FEPA) Act was repealed in 2007.

Institutional restructuring created a modern statutory agency with updated enforcement powers.

2

Select the specific agency created under the 2007 Act.

The National Environmental Standards and Regulations Enforcement Agency (NESREA) was established.

NESREA inherited FEPA's broad mandate to enforce environmental standards, laws, and regulations across Nigeria.

Key Concept

Establishment of NESREA as Nigeria's main environmental enforcement body replacing FEPA

Question 12559Question →

During a geomorphological field survey on a steep granite hillslope in a humid tropical environment, researchers observed a sudden planar failure where a thick mantle of saturated regolith slid rapidly downslope along a bedrock interface. Which of the following fundamental characteristics distinguishes this mass wasting event from the chemical weathering (hydrolysis) that originally formed the regolith?

The mass wasting event involves the downslope transportation of rock mantle by gravity, while chemical weathering causes in-situ breakdown of minerals without slope movement.

The mass wasting event alters the mineral composition of granite into clay, while chemical weathering strictly transports intact soil blocks down slope.

The mass wasting event recrystallizes the regolith into metamorphic slate, while chemical weathering deposits marine sediments along the slope foot.

The mass wasting event occurs purely through wind abrasion on exposed slopes, while chemical weathering is exclusively driven by tectonic uplift.

Show answer & explanation

Answer: The mass wasting event involves the downslope transportation of rock mantle by gravity, while chemical weathering causes in-situ breakdown of minerals without slope movement.

Answer

Mass wasting involves the downslope displacement of weathered material under the direct influence of gravity, whereas weathering is the in-situ disintegration or decomposition of rocks without transportation.

Mass wasting refers specifically to the gravitational movement of weathered rock materials and soil down a slope. Weathering, such as hydrolysis operating on granite in humid environments, is an in-situ process that breaks down minerals chemically in place without transporting them downslope.

Step-by-Step Solution

1

Identify the primary mechanism of the downslope movement described in the scenario.

The rapid sliding of saturated regolith down a hillslope represents mass wasting.

Mass wasting refers specifically to the downslope movement of soil, regolith, and rock debris under the force of gravity.

2

Identify the nature of the chemical weathering process (hydrolysis) mentioned.

Hydrolysis decomposes granitic minerals (such as feldspar into clay minerals) in place.

Weathering is an in-situ process occurring on static rock masses prior to transportation.

3

Differentiate between the two processes based on motion and displacement.

Mass wasting involves bulk transportation down a slope, while weathering involves no overall displacement.

The key criterion distinguishing weathering from mass wasting (and erosion) is whether the breakdown occurs in-situ or involves downslope movement.

Key Concept

Distinction between in-situ weathering breakdown and downslope mass wasting under gravity

Estimated Time:2m 0s

Question 12560Question →

The strategic siting of Nigeria's premier integrated iron and steel industrial complex at Ajaokuta in Kogi State was primarily determined by proximity to which of the following combinations of raw materials?

Iron ore deposits at Itakpe and limestone quarries at Jakura

Large urban market centers and commercial port terminals in Lagos and Ibadan

Sub-bituminous coal fields in the Niger Delta basin and imported bauxite

Petroleum refineries at Port Harcourt and natural gas fields at Warri

Show answer & explanation

Answer: Iron ore deposits at Itakpe and limestone quarries at Jakura

Answer

Iron ore deposits at Itakpe and limestone quarries at Jakura

The correct option highlights the iron ore reserves at Itakpe and limestone at Jakura. Primary iron and steel smelting is a classic heavy, weight-losing manufacturing process. Siting the Ajaokuta Steel Company in Kogi State dramatically lowers production costs by placing the plant in close spatial proximity to its essential mineral inputs.

Step-by-Step Solution

1

Identify the industrial classification of primary iron and steel smelting.

Primary iron smelting is classified as a heavy, weight-losing industry dependent on massive inputs of iron ore and fluxing material (limestone).

According to Weber's industrial location theory, weight-losing processes incur high raw material transport costs and must be located near mineral extraction sites.

2

Map the raw material locations supporting the Ajaokuta steel complex in Kogi State.

The plant is situated near the Itakpe hill iron ore deposit (about 52 km away) and the Jakura limestone quarry.

Proximity to these heavy essential minerals minimizes total ton-kilometer transportation costs for raw materials.

Key Concept

Raw Material Orientation in Heavy Mineral Processing Industries

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