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Question 12461Question →

On a topographical map extract drawn at a scale of 1:50,0001:50,000, a river valley features V-shaped contour lines that point consistently toward the south-west. Point X lies directly on the 450 m450\text{ m} contour line, while Point Y lies 5 km5\text{ km} further down the channel path on the 200 m200\text{ m} contour line. Based on these topographic observations, toward which direction does the river flow, and what is its average channel gradient between Point X and Point Y?

Show answer & explanation

Answer: Toward the north-east at a gradient of 1 in 201\text{ in }20

Answer

The river flows toward the north-east at an average channel gradient of 1 in 201\text{ in }20.
In topographic map interpretation, contour lines form 'V' shapes when crossing river valleys, with the apex of the 'V' pointing upstream toward higher elevation. Because the V-shapes point south-west toward the 450 m450\text{ m} contour, the river must flow downstream toward the lower 200 m200\text{ m} contour in the north-east direction. Furthermore, the gradient calculation requires dividing the Vertical Interval (450 m−200 m=250 m450\text{ m} - 200\text{ m} = 250\text{ m}) by the Horizontal Equivalent (5 km=5,000 m5\text{ km} = 5,000\text{ m}), giving 2505,000=120\frac{250}{5,000} = \frac{1}{20} (or 1 in 201\text{ in }20).

Step-by-Step Solution

1
Determine flow direction from V-shaped contour lines
The river flows toward the north-east.
V-shaped contour lines crossing a river valley always point apex-upstream (toward higher ground/source). Since the V's point south-west (toward 450 m450\text{ m}), the river flows down the elevation slope toward the north-east (toward 200 m200\text{ m}).
2
Calculate Vertical Interval (VI)
VI=250 m\text{VI} = 250\text{ m}
Difference in elevation between Point X (450 m450\text{ m}) and Point Y (200 m200\text{ m}) is 450 m−200 m=250 m450\text{ m} - 200\text{ m} = 250\text{ m}.
3
Convert Horizontal Equivalent (HE) to consistent units
HE=5,000 m\text{HE} = 5,000\text{ m}
The horizontal distance along the river course is 5 km=5×1,000 m=5,000 m5\text{ km} = 5 \times 1,000\text{ m} = 5,000\text{ m}.
4
Compute stream gradient ratio
Gradient=250 m5,000 m=120\text{Gradient} = \frac{250\text{ m}}{5,000\text{ m}} = \frac{1}{20} (1 in 201\text{ in }20)
Gradient is expressed as VI/HE\text{VI} / \text{HE}, simplifying 2505000\frac{250}{5000} to 120\frac{1}{20}.

Key Concept

Valley Contour Interpretation and Topographic Stream Gradient Analysis
Question 12462Question →

In a glaciated mountain region, a massive main-trunk glacier erodes its valley far deeper than smaller feeder glaciers. Upon deglaciation, the tributary valleys remain perched high above the main trough floor, typically featuring plunging waterfalls. Which landform does this description represent?

Show answer & explanation

Answer: Hanging valley

Answer

Hanging valley
A hanging valley forms when a main trunk glacier erodes its valley floor much deeper than smaller tributary glaciers. When the ice melts, the floor of the tributary valley is left suspended high above the main glacial trough, often giving rise to waterfalls.

Step-by-Step Solution

1
Analyze the landform features described in the stem
The landform is located in a glaciated mountain valley, sits elevated above the main valley floor, and creates waterfalls where streams flow out of it.
Main trunk glaciers possess far greater volume and erosive capacity than tributary glaciers, gouging the main trough much deeper.
2
Identify the specific geological feature and rule out non-glacial processes
Differential ice erosion between main and tributary glaciers forms a hanging valley. Oxbow lakes and deltas are river features, while scree slopes result from mass wasting.
Perched tributary troughs created by differential glacial deepening are uniquely classified as hanging valleys.

Key Concept

Hanging Valley Formation in Glacial Troughs
Estimated Time:1m 0s
Question 12463Question →

In Nigeria, environmental regulation responsibilities are divided among specialized bodies. Which agency has the primary statutory mandate to implement the National Oil Spill Contingency Plan and manage oil spill containment?

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Answer: National Oil Spill Detection and Response Agency (NOSDRA)

Answer

National Oil Spill Detection and Response Agency (NOSDRA)
The National Oil Spill Detection and Response Agency (NOSDRA) was established by the Federal Government of Nigeria specifically to implement the National Oil Spill Contingency Plan, monitor spill occurrences, and enforce environmental compliance within the petroleum sector.

Step-by-Step Solution

1
Identify the primary responsibility described in the stem.
The focus is on implementing the National Oil Spill Contingency Plan and managing oil spill containment.
Different Nigerian environmental agencies are assigned distinct regulatory scopes.
2
Match the statutory mandate to the correct agency.
NOSDRA is the specialized agency created under Nigerian law for oil spill detection, containment, and remediation.
NESREA regulates broad environmental standards outside upstream oil spill containment, while NEMA manages general disaster relief.

Key Concept

Mandates of Nigerian Environmental Agencies
Estimated Time:50s
Question 12464Question →

During a chain survey along a baseline, a surveyor uses a 20 m20\text{ m} chain that is later discovered to be 0.10 m0.10\text{ m} too short due to bent links. If the recorded length of the baseline is 400 m400\text{ m}, what is the true ground distance of the baseline, and what category of error is produced by this tape defect?

Show answer & explanation

Answer: 398.00 m398.00\text{ m}; cumulative error

Answer

398.00 m398.00\text{ m}; cumulative error
The true ground distance is calculated using the formula True Distance=Recorded Distance×(L′/L)\text{True Distance} = \text{Recorded Distance} \times (L'/L), where L′L' is the actual chain length (19.90 m19.90\text{ m}) and LL is the nominal length (20.00 m20.00\text{ m}). Applying this yields 400×(19.90/20)=398.00 m400 \times (19.90 / 20) = 398.00\text{ m}. Furthermore, because the flaw in the instrument is constant and acts in one direction throughout the survey, the resulting error accumulates continuously, making it a cumulative error.

Step-by-Step Solution

1
Determine the actual length of the chain
Nominal length L=20.00 mL = 20.00\text{ m}; actual length L′=20.00−0.10=19.90 mL' = 20.00 - 0.10 = 19.90\text{ m}.
The chain is 0.10 m0.10\text{ m} too short, so each full chain layout measures only 19.90 m19.90\text{ m} of ground distance.
2
Calculate the true ground distance using the proportion formula
True Distance = Recorded Distance ×L′L=400×19.9020.00=398.00 m\times \frac{L'}{L} = 400 \times \frac{19.90}{20.00} = 398.00\text{ m}.
When an instrument is too short, the measured distance is over-reported, so the true distance must be less than the recorded distance.
3
Classify the nature of the surveying error
Cumulative (systematic) error.
Errors arising from constant instrumental flaws (like an incorrect chain length) always act in the same direction and accumulate in magnitude as more chain lengths are measured.

Key Concept

Chain Surveying Distance Correction and Error Classification
Question 12465Question →

During an Environmental Impact Assessment (EIA) for a proposed dredging project along the lower River Niger, environmental consultants have completed the identification and prediction of potential adverse ecological impacts. According to standard EIA procedural protocol, which step must be executed immediately after impact prediction to address the identified risks before publishing the final EIA statement?

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Answer: Developing mitigation measures and an environmental management plan

Answer

Developing mitigation measures and an environmental management plan
In standard Environmental Impact Assessment (EIA) framework, once potential impacts have been predicted and evaluated, project developers must design specific mitigation strategies and management plans to minimize or remediate those impacts before submitting the final Environmental Impact Statement for approval.

Step-by-Step Solution

1
Identify the standard sequence of Environmental Impact Assessment (EIA) stages
The EIA sequence progresses through: Screening →\rightarrow Scoping →\rightarrow Baseline Assessment →\rightarrow Impact Prediction →\rightarrow Mitigation & Management Planning →\rightarrow EIA Reporting →\rightarrow Decision-Making →\rightarrow Monitoring & Auditing.
Understanding procedural flow is required to determine sequential placement of EIA tasks.
2
Determine the step that directly follows impact prediction
Once environmental impacts are quantified and predicted, measures must be designed to avoid, minimize, or remediate those impacts (mitigation planning).
Mitigation planning synthesizes prediction findings into actionable protective strategies before submitting the final EIA report.

Key Concept

Procedural Sequence of Environmental Impact Assessment (EIA)
Estimated Time:1m 0s
Question 12466Question →

In the semi-arid northern boundary zone of Nigeria encompassing Sokoto and Katsina states, agricultural land faces severe degradation driven primarily by wind erosion and topsoil desiccation. Considering the pedological profile and environmental conditions of this region, which option correctly pairs the prevailing soil characteristics with the most effective soil conservation strategy?

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Answer: Coarse, weakly structured sandy soils with low organic humus and minimal water-retention capacity; managed by establishing multi-row shelterbelts of drought-tolerant trees perpendicular to prevailing winds.

Answer

Coarse, weakly structured sandy soils with low organic humus and minimal water-retention capacity; managed by establishing multi-row shelterbelts of drought-tolerant trees perpendicular to prevailing winds.
The northern extremity of Nigeria features semi-arid conditions where wind erosion dominates. The soil is predominantly coarse, sandy Regosol with low moisture retention. Establishing shelterbelts creates windbreaks that effectively halt topsoil loss and preserve land productivity.

Step-by-Step Solution

1
Identify the geographical region and its associated soil zone
Sokoto and Katsina fall in the northernmost Sahel/Sudan savanna belt of Nigeria, dominated by Regosols and Brown soils.
Zonal soil distribution in Nigeria follows latitudinal climate belts from south to north.
2
Analyze the physical properties of soils in northern Nigeria
Regosols are coarse-textured, highly permeable, sandy, and low in organic content.
Low rainfall and sparse vegetation limit organic matter accumulation and soil horizon development.
3
Determine the principal degradation mechanism and targeted conservation response
Strong dry season winds (Harmattan) cause wind erosion and topsoil desiccation, best mitigated by shelterbelts and afforestation.
Tree barriers break wind speed, trap soil particles, and reduce evaporation.

Key Concept

Zonal distribution of Nigerian Regosols and wind erosion conservation techniques
Estimated Time:2m 0s
Question 12467Question →

A circular or ring-shaped coral reef structure that completely or partially encloses a central lagoon is classified as which type of reef?

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Answer: Atoll

Answer

An atoll is a ring-shaped coral reef surrounding a central lagoon.
An atoll is a ring-shaped coral reef that completely or partially surrounds a central body of water known as a lagoon. It typically develops when a oceanic volcano subsides over time while coral polyps continue building upward towards the water surface.

Step-by-Step Solution

1
Identify the key geometric and geomorphic characteristics given in the prompt.
The landform described is a circular/ring reef structure enclosing a central lagoon.
Coral reef types are categorized based on their structural relationship to landmasses and lagoons.
2
Compare the feature against known coral reef classes.
Fringing reefs touch the coast directly, barrier reefs parallel coasts separated by open water, and atolls form enclosed rings around lagoons.
Morphological classification establishes atoll as the exact match.

Key Concept

Types of Coral Reefs and Coastal Organic Landforms
Question 12468Question →

Match each physical region of Nigeria listed on the left with its correct relief and drainage characteristic on the right.

Click a left item, then click its matching right item

Items

Eastern Scarplands
Benue Trough
High Plains of Hausaland
Oban Hills

Matches

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Answer

Eastern Scarplands matches the asymmetrical cuesta topography; Benue Trough matches the linear sedimentary structural rift valley; High Plains of Hausaland matches the broad crystalline basement plain with inselbergs; Oban Hills matches the rugged crystalline basement complex massif in southeastern Nigeria.
Each physical region of Nigeria is correctly paired based on its distinctive geological foundation, relief forms, and hydrographic function: the Eastern Scarplands exhibit cuesta landforms that divide river basins; the Benue Trough is a sedimentary rift valley with broad alluvial floodplains; the High Plains of Hausaland form an extensive basement plateau with inselbergs serving as a northern watershed; and the Oban Hills represent a dissected crystalline highland in the southeast.

Step-by-Step Solution

1
Analyze the structural and topographical features of the Eastern Scarplands.
Identify that the region is defined by cuesta landforms forming a drainage divide between the Anambra and Cross River basins.
Cuesta topography with dip and scarp slopes is characteristic of the sedimentary scarplands around Enugu and Nsukka.
2
Examine the formation and drainage layout of the Benue Trough.
Identify it as a sedimentary rift valley containing wide floodplains fed by several large tributaries.
The trough is a long structural depression that formed during Cretaceous rifting.
3
Evaluate the relief characteristics of the High Plains of Hausaland.
Recognize the extensive basement plain studded with inselbergs that acts as a major northern watershed.
This region covers much of northern interior Nigeria on ancient crystalline basement rocks.
4
Identify the geographical setting of the Oban Hills.
Associate it with the crystalline basement highland in southeastern Nigeria drained into the Cross River and Atlantic coast.
The Oban Hills form part of the southeastern highland block near the Cameroon border.

Key Concept

Geomorphology and Hydrography of Physical Regions in Nigeria
Question 12469Question →

Complete the statement regarding rural settlement morphometry by supplying the precise geographical terms for the spatial patterns described.

Fill in the blanks below

Rural homesteads that grow along the crest of a natural levee or river embankment form a settlement pattern, whereas homesteads arranged in a perimeter around a shared village pasture or central pond construct a settlement pattern.
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Answer

Blank 1 requires 'linear' (or 'ribbon'), which describes a settlement constrained along a narrow continuous physical feature like a levee. Blank 2 requires 'ring' (or 'circular'), which describes homesteads arranged around a central communal area.
Settlements following narrow linear terrain features such as natural river levees naturally form linear (or ribbon) arrangements. Settlements where structures surround a central open space, communal grazing pasture, or water source form ring (or circular) settlement patterns.

Step-by-Step Solution

1
Analyze the spatial constraint of a settlement situated along a river embankment or levee.
Determine that physical lateral boundaries force buildings to extend continuously in a narrow line.
Topographical linear constraints restrict lateral growth and produce an elongated line arrangement.
2
Analyze the spatial arrangement of dwellings surrounding a central communal green or pond.
Determine that buildings surrounding a common central feature form a circular or ring pattern.
Encircling a central resource provides equal access to communal space while offering defensive advantages.

Key Concept

Morphological classification of rural settlements according to physical terrain constraints and focal points.
Question 12470Question →

A river undergoes rejuvenation when its erosive energy is renewed due to a fall in sea level or tectonic uplift of the land. Which of the following landforms is formed as a direct result of river rejuvenation?

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Answer: River terraces

Answer

River terraces
River terraces are step-like benches abandoned above a new valley floor when a river experiences rejuvenation, providing it with renewed energy to erode vertically into its former floodplain.

Step-by-Step Solution

1
Identify the primary geomorphological trigger described in the stem.
The trigger is river rejuvenation caused by base-level lowering or land uplift.
Rejuvenation increases the stream's gradient and potential energy, triggering renewed vertical downcutting.
2
Analyze how active downcutting affects existing valley features.
The river incision carves a deep inner valley into its old floodplain, leaving step-like benches along the valley sides.
These step-like features, known as paired or unpaired river terraces, mark the former levels of the valley floor before rejuvenation occurred.

Key Concept

River Rejuvenation and Terrace Formation
Question 12471Question →

Match each physical landform listed on the left with its precise developmental process and structural characteristics under aeolian or glacial action on the right.

Click a left item, then click its matching right item

Items

Yardang
Zeugen
Roche Moutonnée
Drumlin

Matches

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Answer

Yardang matches with the aeolian erosional ridge formed on vertically tilted strata parallel to prevailing winds; Zeugen matches with the flat-topped ridge formed on jointed horizontal cap-rock; Roche Moutonnée matches with the asymmetric erosional bedrock hill exhibiting a gentle smoothed stoss side and steep plucked lee side; Drumlin matches with the streamlined depositional mound of till exhibiting a steep blunt stoss side and tapering lee tail.
The matching correctly pairs each landform with its exact agent (wind vs glacier), process (abrasion/plucking vs deposition), and structural orientation (vertical vs horizontal strata, stoss vs lee slope profiles).

Step-by-Step Solution

1
Analyze aeolian erosional landforms by structural strata orientation
Identify that Yardangs form on vertically aligned rock bands, whereas Zeugen form on horizontally bedded strata with jointed cap-rocks.
Differential wind abrasion attacks structural weaknesses based on whether strata inclination is vertical or horizontal.
2
Differentiate glacial erosional landforms from depositional landforms
Identify Roche Moutonnée as an erosional bedrock feature formed by combined abrasion and plucking, and Drumlin as a depositional feature composed of unsorted glacial drift.
Erosional glacial landforms sculpt solid bedrock, while depositional glacial landforms aggregate till under moving ice mass.
3
Examine stoss-and-lee slope polarity for Roche Moutonnée versus Drumlin
Confirm that a Roche Moutonnée has a gentle stoss slope up-ice and a steep lee slope down-ice, whereas a Drumlin has a steep stoss side up-ice and a gentle tapering lee tail down-ice.
Glacial ice abrades the up-ice side of bedrock obstacles (Roche Moutonnée) but deposits and molds till heavily on the advancing up-ice side of drumlins.

Key Concept

Structural and Process Mechanics in Aeolian and Glacial Landform Development
Estimated Time:2m 0s
Question 12472Question →

Match each elementary surveying accessory or instrument on the left with its precise operational function during field survey procedures on the right.

Click a left item, then click its matching right item

Items

Optical square
Plumb bob
Clinometer
Trough compass

Matches

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Answer

Optical square matches setting out 90∘90^\circ offsets; Plumb bob matches centering equipment over ground pegs; Clinometer matches measuring vertical slope angles; Trough compass matches orienting a plane table to magnetic north.
Each instrument serves a distinct purpose in fieldwork setup and measurement: the optical square sets out 90∘90^\circ offsets; the plumb bob ensures precise vertical centering over ground pegs; the clinometer measures vertical slope angles for distance corrections; and the trough compass aligns plane tables to magnetic north.

Step-by-Step Solution

1
Identify the primary function of the optical square
Optical squares utilize double-reflection optics to construct perpendicular lines (90∘90^\circ offsets) relative to a baseline.
It ensures offset distances measured to nearby features are exactly perpendicular to the main survey line.
2
Identify the primary function of the plumb bob
Plumb bobs suspend vertically under gravity to align an overhead instrument center with a peg on the ground.
Accurate centering eliminates index and displacement errors at station points.
3
Identify the primary function of the clinometer
Clinometers measure vertical slope inclination angles.
Knowing slope angles allows conversion of surface distances measured along slopes into true horizontal ground distances.
4
Identify the primary function of the trough compass
Trough compasses align the board edges of plane tables parallel to the magnetic north magnetic meridian.
Proper orientation ensures consistent directional accuracy across all station setups in plane table surveying.

Key Concept

Fieldwork functions of elementary surveying tools and accessories
Question 12473Question →

On a topographical map with a scale of 1:50,0001 : 50,000, a footpath connects a valley station at an elevation of 250 m250\text{ m} to a mountain peak at 650 m650\text{ m}. If the distance between the two points measured along the footpath on the map is 8 cm8\text{ cm}, what is the average gradient of the slope?

Show answer & explanation

Answer: 1 in 101\text{ in }10

Answer

The average gradient of the slope between the valley station and the mountain peak is 1 in 101\text{ in }10.
The correct answer is obtained by finding the difference in height between the two points (650 m−250 m=400 m650\text{ m} - 250\text{ m} = 400\text{ m}) and dividing it by the ground horizontal distance (8 cm×500 m/cm=4,000 m8\text{ cm} \times 500\text{ m/cm} = 4,000\text{ m}). The resulting ratio 4004000\frac{400}{4000} simplifies to 1 in 101\text{ in }10.

Step-by-Step Solution

1
Calculate the Vertical Interval (VI)
VI=650 m−250 m=400 m\text{VI} = 650\text{ m} - 250\text{ m} = 400\text{ m}
Vertical interval is the difference in elevation between the highest and lowest points.
2
Calculate the Horizontal Equivalent (HE) using map scale
HE=8 cm×50,000=400,000 cm=4,000 m\text{HE} = 8\text{ cm} \times 50,000 = 400,000\text{ cm} = 4,000\text{ m}
Map scale of 1:50,0001 : 50,000 means 1 cm1\text{ cm} on map represents 50,000 cm50,000\text{ cm} (500 m500\text{ m}) on the ground.
3
Calculate the gradient ratio
Gradient=VIHE=400 m4,000 m=110\text{Gradient} = \frac{\text{VI}}{\text{HE}} = \frac{400\text{ m}}{4,000\text{ m}} = \frac{1}{10} or 1 in 101\text{ in }10
Gradient is expressed as the ratio of vertical rise to horizontal distance.

Key Concept

Topographic Gradient Calculation
Question 12474Question →

Match each Nigerian mineral resource or energy generation plant on the left with its principal deposit location or host site on the right.

Click a left item, then click its matching right item

Items

Barite (industrial vein deposits used in drilling mud)
Lignite (Tertiary brown coal deposits)
Jakura Marble (metamorphic crystalline carbonate)
Egbin Thermal Power Station (gas-fired facility)

Matches

Show answer & explanation

Answer

Barite matches with Azara (Nasarawa State); Lignite matches with Ogwashi-Uku (Delta State); Jakura Marble matches with Lokoja axis (Kogi State); and Egbin Thermal Power Station matches with Ikorodu axis (Lagos State).
Each resource or infrastructure item correctly pairs with its specific geographic site in Nigeria: Barite is mined at Azara (Nasarawa State); Lignite is concentrated at Ogwashi-Uku (Delta State); Jakura Marble occurs near Lokoja (Kogi State); and Egbin Thermal Power Station operates at Ikorodu (Lagos State).

Step-by-Step Solution

1
Identify the primary mining location for vein barite deposits in Nigeria.
Barite, vital as a weighting agent in petroleum drilling mud, is mainly mined from vein deposits located at Azara in Nasarawa State.
Hydrothermal mineralization in the Benue Trough concentrates industrial barite veins in Nasarawa State.
2
Locate the major Tertiary lignite (brown coal) seam formations in southern Nigeria.
Lignite deposits belong to the Ogwashi-Asaba geological formation, prominently exposed around Ogwashi-Uku in Delta State.
Unlike the Cretaceous sub-bituminous coal of Enugu, lignite is a younger Tertiary fuel found along the lower Niger sedimentary basin.
3
Determine the geographical location of the Jakura marble deposit.
Jakura marble occurs within the Precambrian Basement Complex rocks in Kogi State near Lokoja.
Metamorphic re-crystallization of ancient limestones created high-grade marble in the Lokoja district.
4
Identify the host location of the Egbin thermal power installation.
Egbin Thermal Power Station is situated along the lagoon at Egbin near Ikorodu, Lagos State.
It relies on natural gas piped from the Niger Delta oil fields to power steam turbines generating electricity for the national grid.

Key Concept

Spatial distribution of non-metallic minerals, solid fossil fuels, and major thermal power plants in Nigeria
Question 12475Question →

In the industrial geography of Nigeria, leather product manufacturing relies on an inter-regional value chain connecting pastoral livestock regions to light assembly clusters. Arrange the following sequential stages of this manufacturing process in order from raw material harvesting to final finished product distribution.

Drag items to arrange them in the correct order

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Answer

The correct sequence starts with hide flaying in Sokoto/Maiduguri, followed by tanning in Kano, southward haulage along transit corridors, and final footwear assembly in Aba and Lagos.
The manufacturing process follows a logical spatial and industrial sequence: raw animal hides are first collected in northern pastoral belts (Sokoto/Maiduguri), then processed into leather at raw-material-oriented tanneries in Kano. The tanned leather is subsequently transported south along main freight corridors to market-oriented assembly hubs like Aba and Lagos, where skilled labor transforms the leather into finished commercial footwear and accessories.

Step-by-Step Solution

1
Identify the raw material extraction point in the geographical value chain.
Primary raw hides originate from livestock pastoralism in northern states like Sokoto and Borno.
Manufacturing value chains always begin with primary commodity collection before industrial processing.
2
Determine the primary industrial processing location based on raw material proximity.
Tanning factories convert perishable hides into durable leather sheets in Kano.
Tanneries are weight-losing and perishable-input industries, making them raw-material-oriented and situated close to livestock hubs.
3
Trace the spatial movement of intermediate industrial inputs across geographical regions.
Tanned leather is hauled southward via highway and railway transport infrastructure.
Intermediate goods must bridge the geographical gap between northern raw material sources and southern consumer demand centers.
4
Locate the secondary manufacturing stage producing consumer-ready goods.
Finished footwear and leather goods are fabricated in commercial clusters like Aba and Lagos.
Footwear assembly is market-oriented and labor-intensive, taking advantage of large urban consumer markets and skilled labor pools in southern cities.

Key Concept

Inter-Regional Industrial Value Chain and Location Factors in Nigeria
Estimated Time:2m 0s
Question 12476Question →

In agricultural geography, Ester Boserup's model demonstrates how increasing population density drives progressive land-use intensification by shortening the fallow period. Arrange the following traditional and modern agricultural systems in order of INCREASING land-use intensity and frequency of crop harvesting (from the lowest cropping frequency to the highest cropping frequency).

Drag items to arrange them in the correct order

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Answer

The correct sequence of agricultural systems from least intensive to most intensive is: Forest fallow system → Bush fallow system → Short / Grass fallow system → Annual cropping system → Multi-cropping continuous system.
Boserup's theory demonstrates that agricultural land-use transitions systematically under population pressure from extensive land use (forest fallow with 20–25 years resting) to bush fallow (6–10 years resting), short/grass fallow (1–2 years resting), annual cropping (single annual crop), and finally continuous multi-cropping (zero fallow, multi-harvest).

Step-by-Step Solution

1
Identify the core metric of Boserup's agricultural intensification theory
Intensity of agricultural land use is inversely proportional to fallow length and directly proportional to cultivation frequency.
The theory establishes that as population pressure rises, long fallow periods are progressively shortened.
2
Evaluate the fallow duration of extensive farming systems
Forest fallow (20–25 years fallow) is less intensive than bush fallow (6–10 years fallow).
Forest fallow allows complete ecological succession back to primary/secondary forest before re-clearing, giving it the lowest cropping frequency.
3
Evaluate short-cycle fallow systems
Short/grass fallow (1–2 years fallow) sits between bush fallow and permanent cultivation.
Short fallow cycles occur under high land scarcity where woody vegetation can no longer re-establish.
4
Order permanent and semi-permanent cropping systems
Annual cropping (one harvest per year) is followed by multi-cropping (multiple harvests per year with zero fallow).
Multi-cropping continuous systems utilize advanced land management (irrigation, fertilization, intercropping) to yield multiple crops annually from the same plot.

Key Concept

Boserup's Model of Agricultural Intensification and Fallow Reduction
Question 12477Question →

Before initiating a major hydroelectric dam project along the Benue River, developers are required to conduct an Environmental Impact Assessment (EIA). What is the primary purpose of carrying out this assessment?

Show answer & explanation

Answer: To identify potential environmental consequences and integrate mitigation measures before project approval and construction

Answer

The primary purpose of an Environmental Impact Assessment (EIA) is to identify potential environmental consequences and integrate mitigation measures before project approval and construction.
Conducting an Environmental Impact Assessment ensures that potential negative effects on ecosystems, water quality, and human settlements are forecasted and addressed with appropriate mitigation strategies before development begins.

Step-by-Step Solution

1
Analyze the core function of Environmental Impact Assessment (EIA)
EIA is a proactive planning tool used to predict social, economic, and ecological impacts of proposed projects.
Understanding the baseline definition distinguishes preventive environmental planning from post-construction evaluation or geological exploration.
2
Evaluate the options against the timing and objectives of an EIA
Identifying impacts and formulating mitigation strategies prior to project commencement aligns directly with EIA objectives.
EIAs must take place early in the decision-making process to ensure sustainable development principles are applied.

Key Concept

Primary Objective of Environmental Impact Assessment (EIA)
Estimated Time:45s
Question 12478Question →

Match each African mining center listed on the left with its primary mineral resource on the right.

Click a left item, then click its matching right item

Items

Arlit (Niger)
Kimberley (South Africa)
Enugu (Nigeria)
Obuasi (Ghana)

Matches

Show answer & explanation

Answer

Arlit matches Uranium, Kimberley matches Diamond, Enugu matches Coal, and Obuasi matches Gold.
Arlit in Niger produces uranium, Kimberley in South Africa is historic for diamond extraction, Enugu in Nigeria is known for coal deposits, and Obuasi in Ghana is famous for gold mining.

Step-by-Step Solution

1
Identify the primary mineral extracted in Arlit, Niger.
Arlit is a primary site for uranium extraction in the Sahara region of Niger.
Niger is one of the world's leading producers of uranium ore.
2
Identify the primary mineral extracted in Kimberley, South Africa.
Kimberley is renowned for diamond mining.
The famous 'Big Hole' at Kimberley was the focal point of the late 19th-century diamond rush.
3
Identify the primary mineral extracted in Enugu, Nigeria.
Enugu is famous for coal mining.
Enugu was built around the discovery and extraction of sub-bituminous coal in 1909.
4
Identify the primary mineral extracted in Obuasi, Ghana.
Obuasi is a major gold mining city.
Ghana (formerly Gold Coast) relies heavily on gold reserves centered in regions such as Obuasi.

Key Concept

Geographical Distribution of Mineral Resources in Africa
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Question 12479Question →

Match each African climate type listed on the left with its defining temperature and precipitation characteristics listed on the right.

Click a left item, then click its matching right item

Items

Equatorial Climate
Tropical Savanna Climate
Tropical Desert Climate
Mediterranean Climate

Matches

Show answer & explanation

Answer

Equatorial Climate matches with heavy year-round precipitation with two peak rainfall seasons and a very low annual temperature range; Tropical Savanna Climate matches with alternating wet summer and dry winter seasons governed by the seasonal movement of the ITCZ; Tropical Desert Climate matches with extremely low annual precipitation (<250 mm< 250\text{ mm}) accompanied by a wide diurnal temperature range; Mediterranean Climate matches with mild, rainy winters brought by westerly winds and hot, dry summers under subtropical high pressure.
Each climatic zone is accurately matched with its controlling atmospheric processes and characteristic moisture/thermal signatures across Africa.

Step-by-Step Solution

1
Identify the rainfall and temperature regime of Equatorial Africa.
Equatorial regions experience continuous heating, high humidity, double rainfall maxima (bimodal), and negligible seasonal temperature variation.
Solar intensity remains high throughout the year near the equator, driving constant convection.
2
Analyze the mechanisms driving the Tropical Savanna climatic pattern.
Savanna zones experience a pronounced wet summer when the ITCZ brings maritime tropical air masses, followed by a dry winter under continental tropical air.
Seasonal latitudinal movement of the ITCZ controls rainfall duration across sub-Saharan Africa.
3
Determine the thermal and moisture conditions of African tropical deserts.
Deserts receive under 250 mm250\text{ mm} of rain per year, and lacking cloud cover, undergo rapid heating during the day and rapid radiation loss at night, creating a high diurnal temperature range.
Subtropical high-pressure subsidence suppresses cloud formation and precipitation.
4
Examine the seasonal characteristics of the Mediterranean zones in Africa.
Northern Africa's coast and the Cape region of South Africa experience rain during winter when Westerlies shift equatorward, while summers are dry under high-pressure cells.
Seasonal migration of pressure belts shifts temperate storm tracks over the extreme ends of the continent in winter.

Key Concept

Classification and Characteristics of African Climate Zones
Question 12480Question →

Match each African timber species listed on the left with its corresponding commercial forestry context or economic characteristic on the right.

Click a left item, then click its matching right item

Items

Okoumé (Aucoumea klaineana)
Ebony (Diospyros spp.)
Sapele (Entandrophragma cylindricum)
Teak (Tectona grandis)

Matches

Show answer & explanation

Answer

Okoumé matches with the lightweight indigenous hardwood exploited in Gabon for plywood; Ebony matches with the dense, dark hardwood used for high-value decorative carving; Sapele matches with the aromatic reddish-brown timber used for premium furniture; and Teak matches with the exotic plantation species cultivated to relieve pressure on natural forests.
Each timber species is correctly aligned with its economic role and geographical context. Okoumé forms the backbone of Gabon's veneer/plywood industry; Ebony provides dense dark wood for specialty carving; Sapele is an aromatic mahogany relative widespread in West/Central African rainforest trade; and Teak represents introduced plantation forestry created to conserve natural reserves.

Step-by-Step Solution

1
Differentiate between indigenous tropical rainforest species and introduced exotic plantation species.
Teak is recognized as an introduced exotic timber grown in silvicultural plantations, distinguishing it from native rainforest trees.
Plantation forestry in West Africa frequently uses fast-growing or durable non-native species like Teak to complement natural forest exploitation.
2
Identify country-specific industrial timber specializations in Africa.
Okoumé is tied directly to Gabon, where it constitutes the overwhelming majority of commercial timber harvesting for plywood factories.
Gabon holds near-monopoly natural stocks of Okoumé in its coastal rainforest zones.
3
Distinguish between high-volume structural cabinet hardwoods and rare ornamental woods by physical properties.
Sapele is identified as the aromatic reddish cabinet wood, while Ebony is identified as the ultra-dense black carving wood.
Sapele is exported in large structural volumes for furniture, whereas Ebony's extreme density and color command premium prices for specialized craft items.

Key Concept

Classification, geographic distribution, and commercial utilization of African timber species
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