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Question 12641Question →

A demographic survey carried out in an agricultural district in Nigeria recorded the following age structure: 24,30024,300 children under 15 years of age, 45,00045,000 adults in the economically active age range of 15–64 years, and 6,3006,300 elderly residents aged 65 years and above. What is the dependency ratio of this district, expressed as a percentage?

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Answer: 68

Answer

68%
The dependency ratio expresses the relationship between the dependent segment of the population (those under 15 and those 65 and above) and the productive segment (ages 15–64). Summing the dependents (24,300+6,30024,300 + 6,300) gives 30,60030,600. Dividing 30,60030,600 by the working-age population of 45,00045,000 and multiplying by 100100 yields 68%68\%.

Step-by-Step Solution

1
Determine the size of the dependent population.
Total dependents = 24,300+6,300=30,60024,300 + 6,300 = 30,600.
Demographic dependency includes individuals under 15 years and those aged 65 years and older.
2
Calculate the dependency ratio.
Dependency Ratio=(30,60045,000)×100=68%\text{Dependency Ratio} = \left(\frac{30,600}{45,000}\right) \times 100 = 68\%.
The dependency ratio measures the number of economic dependents supported by every 100 working-age individuals.

Key Concept

Dependency Ratio Calculation
Question 12642Question →

Match each urban environmental or spatial phenomenon listed on the left with its defining geographical characteristic or primary cause on the right.

Click a left item, then click its matching right item

Items

Urban heat island effect
Ribbon development
Urban blight
Squatter settlement expansion

Matches

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Answer

Urban heat island effect matches elevated localized temperatures caused by thermal absorption of paved surfaces; Ribbon development matches linear growth of structures along major transport arteries; Urban blight matches physical deterioration of inner-city infrastructure; Squatter settlement expansion matches proliferation of informal housing due to acute urban housing deficits.
Each urban phenomenon is paired precisely with its defining geographical process: asphalt thermal absorption creates urban heat islands, transportation corridors induce ribbon development, inner-city disinvestment produces urban blight, and severe affordable housing shortages drive informal squatter settlements.

Step-by-Step Solution

1
Examine each urban phenomenon on the left to identify its distinct spatial or environmental operational mechanism.
Isolated four distinct concepts: microclimatic warming, transport-oriented linear sprawl, central city structural decay, and informal housing growth.
Accurate geographical matching requires identifying the core physical or socio-economic process defining each urban challenge.
2
Pair each concept with its defining characteristic on the right.
Urban heat island matches thermal retention from paved surfaces; Ribbon development matches linear corridor growth; Urban blight matches inner-city deterioration; Squatter settlement expansion matches informal housing proliferation.
Each urban challenge exhibits a unique spatial footprint and causation mechanism in human settlement geography.

Key Concept

Urban Settlement Problems and Spatial Dynamics
Question 12643Question →

Match each Nigerian mineral or energy resource listed on the left with its principal deposit site or energy generating location on the right.

Click a left item, then click its matching right item

Items

Bitumen
Iron Ore
Hydroelectric Power
Petroleum (Crude Oil)

Matches

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Answer

Bitumen matches with Agbabu (Ondo State), Iron Ore matches with Itakpe (Kogi State), Hydroelectric Power matches with Kainji (Niger State), and Petroleum (Crude Oil) matches with Oloibiri (Bayelsa State).
Each mineral or energy resource is accurately paired with its primary Nigerian deposit or generation site: Bitumen at Agbabu (Ondo State), Iron Ore at Itakpe (Kogi State), Hydroelectric Power at Kainji (Niger State), and Petroleum at Oloibiri (Bayelsa State).

Step-by-Step Solution

1
Identify the primary deposit site for Bitumen in Nigeria.
Bitumen occurs in extensive tar sand deposits in Ondo State, notably at Agbabu.
Agbabu is recognized as hosting Nigeria's largest proven reserves of bitumen.
2
Identify the main iron ore mining site in Nigeria.
Itakpe in Kogi State is the principal location for high-grade iron ore deposits.
Itakpe supplies raw iron ore to the steel plant at Ajaokuta.
3
Identify the location of major Hydroelectric Power (HEP) generation.
Kainji in Niger State is home to Nigeria's largest and oldest major hydroelectric dam.
The dam uses the discharge of the River Niger to generate hydroelectricity.
4
Identify the historic site of commercial Petroleum discovery in Nigeria.
Oloibiri in Bayelsa State is the historic site where crude oil was first commercially exploited in 1956.
Oloibiri marks the inception of Nigeria's oil boom in the Niger Delta.

Key Concept

Spatial distribution and major operational locations of mineral and energy resources in Nigeria.
Question 12644Question →

Match each specified geographical zone in Nigeria on the left with its characteristic population density pattern and primary geographical driver on the right.

Click a left item, then click its matching right item

Items

Jos Plateau and Mandara Mountains
Cocoa Belt of Southwestern Nigeria
Middle Belt (Niger-Benue Trough)
Sokoto-Rima River Floodplain

Matches

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Answer

The correct matching connects the Jos Plateau and Mandara Mountains to defense-driven nucleated hilltop settlements, the Southwestern Cocoa Belt to high-density cash-crop nucleated villages, the Middle Belt to low-density dispersed farmsteads caused by historical depopulation and tsetse infestation, and the Sokoto-Rima Floodplain to linear ribbon settlements along fadama irrigation zones.
Each Nigerian geographical region exhibits distinct settlement morphologies and density levels shaped directly by physical relief, water availability, historical defense needs, disease vectors, and agricultural practices.

Step-by-Step Solution

1
Analyze physical relief and historical defense factors for highland regions.
Jos Plateau and Mandara Mountains match with defense-driven hilltop nucleated settlements.
Elevated topography provided protection during pre-colonial wars, forcing settlements into concentrated elevated sites.
2
Determine agricultural land-use impacts on settlement density in Southwestern Nigeria.
The Cocoa Belt matches with high population density and nucleated agrarian settlements.
Perennial tree-crop farming generates economic prosperity and encourages settled rural-urban clusters.
3
Evaluate historical and epidemiological constraints in central Nigeria.
The Middle Belt matches with sparse population density and dispersed homesteads.
Historical slave raids depopulated large areas while tsetse fly infestation hampered cattle rearing and dense settlement.
4
Identify hydrological alignment of settlements in northern river basins.
The Sokoto-Rima Floodplain matches with linear settlements following fertile alluvial fadama lands.
Water availability and seasonal irrigation force human settlements to stretch linearly along valley floors.

Key Concept

Factors Influencing Population Density and Settlement Patterns in Nigeria
Question 12645Question →

An environmental research team mapping ecological zones in Nigeria records an upland area above 1,200 metres elevation characterized by mountain grasslands, stunted trees, gallery forests in sheltered valleys, and temperate floral affinities such as Podocarpus. Which vegetation zone of Nigeria is described in this study?

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Answer: Montane Vegetation

Answer

Montane Vegetation is the vegetation zone characterized by upland grasslands, stunted trees, and temperate floral species at high elevations in Nigeria.
Montane vegetation in Nigeria occurs on high plateaus (such as Jos Plateau and Mambilla Plateau) where elevation exceeds 1,200 metres. The lower temperatures at these heights produce unique mountain grasslands, stunted tree growth, and temperate species like Podocarpus.

Step-by-Step Solution

1
Analyze the geographical and physical attributes given in the prompt.
The prompt describes an area with high elevation (>1,200 m), cooler upland temperatures, mountain grasslands, and temperate plant affinities.
Elevation strongly dictates temperature and vegetation zonation in Nigeria.
2
Match the physical features with Nigeria's major vegetation zones.
Upland high-altitude regions like the Jos and Mambilla Plateaus support Montane Vegetation.
Montane zones form isolated ecological islands where altitude modifies the local climate, allowing temperate species and mountain grasslands to thrive.

Key Concept

Montane Vegetation characteristics and distribution in Nigeria
Estimated Time:1m 0s
Question 12646Question →

Which of the following processes describes the in-situ disintegration and chemical decomposition of exposed rocks into smaller fragments without involving any downslope movement?

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Answer: Weathering

Answer

Weathering is the process involving the in-situ disintegration and chemical decomposition of rocks without transport.
The term weathering refers specifically to the in-situ (on-site) disintegration and decomposition of rocks by physical agents, chemical reactions, and biological activity without transport of the material.

Step-by-Step Solution

1
Identify the key characteristics given in the prompt
The key characteristics are 'in-situ' (in place) breakdown and decomposition without downslope movement or transportation.
This isolates static rock decay processes from dynamic transport processes.
2
Distinguish between weathering and transport processes
Weathering represents the static disintegration of parent material, whereas mass wasting, erosion, and metamorphism involve gravity movement, fluid transport, or deep crustal pressure changes.
Weathering is the primary initial step in soil formation providing raw mineral particles.

Key Concept

Weathering as an In-Situ Soil Formation Process
Estimated Time:45s
Question 12647Question →

Which global atmospheric mechanism is primarily responsible for the extreme aridity observed in world trade wind deserts located around latitudes 20∘20^\circ to 30∘30^\circ North and South, such as the Sahara and the Australian Desert?

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Answer: Subtropical high-pressure belt subsidence causing air to warm adiabatically and suppress cloud formation

Answer

Subtropical high-pressure belt subsidence causing air to warm adiabatically and suppress cloud formation
The correct answer highlights that global trade wind deserts lie under the subtropical high-pressure belts (Horse Latitudes). In these belts, descending air contracts and heats adiabatically, reducing relative humidity and preventing the formation of precipitation-producing clouds.

Step-by-Step Solution

1
Identify the geographical location of trade wind deserts
Trade wind deserts (such as the Sahara and Australian Deserts) lie in the subtropical zone between 20∘20^\circ and 30∘30^\circ latitude in both hemispheres.
Determining latitude pinpoints the dominant pressure cell and atmospheric circulation mechanism.
2
Analyze atmospheric circulation in subtropical belts
Air that rises at the Equator moves poleward in the upper troposphere and sinks (subsides) around 30∘30^\circ latitude within the Subtropical High-Pressure cells.
Subsiding air undergoes adiabatic compression, which increases temperature and lowers relative humidity, preventing cloud development.

Key Concept

Subtropical High-Pressure Subsidence as a Climatic Control
Question 12648Question →

During the Northern Hemisphere winter (low-sun season), the southward migration of the thermal equator causes global wind and pressure belts to shift equatorward. Which climatic condition directly occurs over tropical savanna regions (AwAw) in the Northern Hemisphere as a consequence of this seasonal pressure belt displacement?

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Answer: Dominance of dry continental tropical air masses and Northeast Trade Winds, resulting in a pronounced dry season.

Answer

Dominance of dry continental tropical air masses and Northeast Trade Winds, resulting in a pronounced dry season.
Tropical Savanna (AwAw) climates feature distinct wet and dry seasons driven by the annual oscillation of global wind and pressure belts. During the Northern Hemisphere winter, the solar equator shifts south, causing the Inter-Tropical Convergence Zone (ITCZ) to retreat southward. As a result, subtropical high-pressure ridges expand over tropical savanna regions, bringing stable, descending continental tropical air masses and dry Northeast Trade Winds (the Harmattan), which create the dry season.

Step-by-Step Solution

1
Identify the geographical region and seasonal shift described in the stem.
The target region is the Northern Hemisphere tropical savanna (AwAw), and the event is the low-sun (winter) seasonal shift of pressure belts equatorward.
Climatic controls in tropical regions are primarily governed by the seasonal migration of the thermal equator and the Inter-Tropical Convergence Zone (ITCZ).
2
Analyze atmospheric circulation patterns during Northern Hemisphere winter.
The ITCZ moves south toward the equator, bringing the Subtropical High-Pressure Belt and continental tropical (cTcT) air masses southwards over the savanna belt.
Descending air within subtropical high-pressure zones creates stable, dry atmospheric conditions.
3
Determine the prevailing wind system and resulting weather.
The dry Northeast Trade Winds (Harmattan in West Africa) sweep across the savanna, causing a marked dry season.
Outflowing winds from continental interior high-pressure cells carry minimal moisture.

Key Concept

Seasonal migration of global pressure belts and ITCZ as climatic controls for Tropical Savanna (AwAw) climate seasonality.
Question 12649Question →

A field geologist observes a glaciated bedrock feature characterized by a smooth, gently inclined side facing the direction of ice advance and a steep, jagged slope on the down-flow side. Which landform and primary evolutionary process are described?

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Answer: Roche moutonnée formed by glacial abrasion and plucking

Answer

Roche moutonnée formed by glacial abrasion and plucking
The correct answer identifies a roche moutonnée, an asymmetrical bedrock hill formed by glacial erosion. As moving glacial ice encounters a resistant rock obstacle, friction and debris at the glacier base abrade and smooth the up-ice (stoss) slope. On the down-ice (lee) slope, pressure release and refreezing of meltwater cause the ice to pluck out loose jointed rock blocks, leaving a steep, jagged cliff.

Step-by-Step Solution

1
Analyze the landform profile relative to ice movement direction.
The feature exhibits an asymmetrical slope with a smooth up-ice (stoss) side and a craggy down-ice (lee) side.
Slope asymmetry and orientation relative to ice flow are critical diagnostic criteria for glacial landforms.
2
Identify the erosional mechanisms responsible for the profile.
Abrasion smooths the stoss slope under heavy basal ice pressure, while plucking pulls away fractured bedrock on the lee side where pressure is reduced.
The combination of glacial abrasion and plucking acting on solid bedrock uniquely creates a roche moutonnée.
3
Distinguish this feature from depositional glacial and non-glacial landforms.
A drumlin has an inverted profile (steep stoss, gentle lee tail) and consists of deposited till rather than eroded bedrock, while terraces and pedestals originate from fluvial or aeolian/weathering action.
Eliminating options based on material composition and process origins confirms the correct choice.

Key Concept

Roche Moutonnée Formation and Glacial Erosional Processes
Question 12650Question →

When an industrial firm evaluates potential locations for establishing a manufacturing plant using spatial economic principles, a multi-stage location assessment is conducted. Arrange the following steps of the industrial site selection process in the correct sequential order, from initial raw material evaluation to final agglomeration analysis.

Drag items to arrange them in the correct order

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Answer

The correct sequence begins with calculating the Material Index, followed by locating the point of minimum transport cost, then evaluating labor cost differentials, and finally assessing agglomeration advantages.
The logical sequence follows classical industrial location methodology: first establishing material weight loss characteristics (Material Index), next determining the minimum transport cost locus, then examining labor wage deviations, and finally evaluating cluster agglomeration benefits.

Step-by-Step Solution

1
Determine primary transport orientation using material weight ratios
Calculated the Material Index to identify whether inputs lose or gain weight during processing.
Understanding material weight transformation establishes whether the plant should orient toward input sources or consumer markets.
2
Identify the minimum transport cost location
Determined the geographic point where total assembly freight and finished product delivery freight are minimized.
Transportation represents the foundational baseline cost in industrial location theory.
3
Adjust for spatial labor wage differentials
Assessed whether labor savings at an alternative site outweigh the extra freight charges incurred by shifting away from the transport locus.
Labor acts as a secondary factor that can divert location away from the pure transport-least-cost point.
4
Incorporate agglomeration and external economies
Finalized plant location by deciding if co-locating with complementary industries in a cluster offers superior economic savings.
Agglomeration forces are analyzed last to account for external benefits like shared infrastructure, specialized labor pools, and industrial linkage.

Key Concept

Sequential Stages of Industrial Location Assessment
Estimated Time:1m 30s
Question 12651Question →

Match each specialized African farming system or agricultural scheme listed on the left with its defining environmental adaptation or operational mechanism on the right.

Click a left item, then click its matching right item

Items

Terrace Farming (e.g., Kofyar and Mandara Highlands)
Mediterranean Farming (e.g., Cape Region of South Africa)
Gezira Scheme (Sudan)
Sahelian Pastoral Nomadism

Matches

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Answer

Terrace Farming matches with hillside soil retention using stone walls; Mediterranean Farming matches with crop cultivation adapted to winter rainfall; Gezira Scheme matches with gravity-fed canal irrigation; Sahelian Pastoral Nomadism matches with transhumance following seasonal rainfall shifts.
Each agricultural system reflects an adaptation to regional climate and physical landscape. Highland farmers use terracing to prevent soil loss on slopes; Mediterranean zones cultivate crops adapted to winter rains; riverine schemes like Gezira harness river slopes for gravity-fed irrigation; and dryland pastoralists move herds seasonally along rainfall gradients.

Step-by-Step Solution

1
Identify the geographical and environmental setting for each agricultural system.
Terrace farming belongs to steep highlands, Mediterranean farming to winter-rainfall zones, Gezira to alluvial river basins, and pastoral nomadism to semi-arid drylands.
Topography and climate dictate the operational method used by each agricultural system.
2
Pair each agricultural practice on the left with its specific operational mechanism on the right.
Terracing controls slope degradation; Mediterranean agriculture utilizes winter rains; Gezira uses gravity canal networks; Sahelian pastoralism uses seasonal transhumance.
Matching each system to its primary adaptation resolves the relationship accurately.

Key Concept

Regional adaptations and operational methods of African agricultural systems
Question 12652Question →

In many developing nations, rapid population influx causes cities to expand outward uncontrollably into surrounding countryside and agricultural land, leading to disorganized peripheral development and infrastructure deficits. Which of the following concepts best describes this physical expansion of cities into rural hinterlands?

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Answer: Urban sprawl

Answer

Urban sprawl
Urban sprawl represents the continuous, uncontrolled spatial growth of urban areas into neighboring countryside, resulting in unplanned peripheral settlements.

Step-by-Step Solution

1
Identify the geographical spatial process described in the stem.
The process involves the uncontrolled physical expansion of cities into adjacent rural fringes.
Categorizing land-use conversion at the city margin helps identify specific urban growth phenomena.
2
Match the identified spatial growth characteristics to standard geographical concepts.
Low-density, unplanned outward expansion into rural hinterlands is defined as urban sprawl.
Distinguishing peripheral expansion from inner-city redevelopment or rural migration ensures proper terminology application.

Key Concept

Urban sprawl and peripheral settlement expansion
Question 12653Question →

Match each rock specimen listed under Column I with its precise genetic formation process and primary economic application described under Column II.

Click a left item, then click its matching right item

Items

Bauxite
Syenite
Slate
Travertine

Matches

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Answer

Bauxite corresponds to the residual sedimentary deposit serving as aluminum ore; Syenite corresponds to the plutonic intermediate igneous rock used in construction; Slate corresponds to the low-grade foliated metamorphic rock derived from shale used for roofing; Travertine corresponds to the chemical sedimentary mineral spring deposit used for decorative cladding.
Each rock specimen is accurately paired with its geological formation mechanism and economic application: Bauxite is a residual sedimentary aluminum ore; Syenite is a plutonic igneous construction stone; Slate is a foliated metamorphic material derived from shale; and Travertine is a chemically precipitated limestone used in architecture.

Step-by-Step Solution

1
Identify the origin and economic utility of Bauxite.
Bauxite is a residual sedimentary rock formed through intense leaching (laterization) in warm, humid tropical climates and is the chief source of aluminum.
Recognizing the chemical weathering process distinguishes Bauxite from mechanically formed sedimentary rocks.
2
Determine the genesis and industrial application of Syenite.
Syenite is a coarse-grained intrusive igneous rock similar to granite but lacking quartz, mined for heavy structural work and decorative stone.
Plutonic rocks crystallize slowly beneath the surface, giving Syenite its coarse crystalline texture.
3
Analyze the metamorphic origin and physical property of Slate.
Slate develops from shale protoliths subjected to low-grade regional heat and pressure, imparting a planar cleavage that makes it easy to split into thin sheets.
Foliation characteristics directly determine its commercial utility as durable roofing tiles.
4
Distinguish the precipitative origin of Travertine.
Travertine is formed by inorganic precipitation of calcium carbonate at geothermal springs and is cut and polished for architectural tiles.
Chemical precipitation differentiates Travertine from organic or clastic limestones.

Key Concept

Rock Types, Genesis, and Economic Importance
Question 12654Question →

For a science exhibition, a student coordinator needs to choose 44 project displays from a pool of 66 chemistry projects and 44 physics projects. If the selection must include at least 22 chemistry projects, in how many distinct ways can the projects be selected?

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Answer: 185185

Answer

The total number of distinct ways to select the projects is 185185.
The correct total number of ways is 185185. The condition requiring at least 22 chemistry projects splits the total selection into three mutually exclusive scenarios: selecting 22 chemistry and 22 physics projects (9090 ways), 33 chemistry and 11 physics project (8080 ways), or 44 chemistry projects (1515 ways). Adding these together yields 90+80+15=18590 + 80 + 15 = 185.

Step-by-Step Solution

1
Identify the distinct valid cases for selecting 44 projects with at least 22 chemistry projects.
Case 1: 22 chemistry and 22 physics; Case 2: 33 chemistry and 11 physics; Case 3: 44 chemistry and 00 physics.
The phrase 'at least 2 chemistry projects' means the number of chemistry projects can be 22, 33, or 44.
2
Calculate the combinations for Case 1 (22 chemistry, 22 physics).
\(\binom{6}{2} \times \binom{4}{2} = 15 \times 6 = 90\) ways.
We select 22 projects out of 66 chemistry projects and 22 out of 44 physics projects using the combination formula \(\binom{n}{r} = \frac{n!}{r!(n-r)!}\).
3
Calculate the combinations for Case 2 (33 chemistry, 11 physics).
\(\binom{6}{3} \times \binom{4}{1} = 20 \times 4 = 80\) ways.
We select 33 projects out of 66 chemistry projects and 11 out of 44 physics projects.
4
Calculate the combinations for Case 3 (44 chemistry, 00 physics).
\(\binom{6}{4} \times \binom{4}{0} = 15 \times 1 = 15\) ways.
We select 44 projects out of 66 chemistry projects and 00 out of 44 physics projects.
5
Sum the number of ways from all mutually exclusive cases.
\(90 + 80 + 15 = 185\) ways.
By the addition principle of counting, the total number of ways is the sum of the ways from each independent case.

Key Concept

Combinations with Constraints (At Least / At Most)
Question 12655Question →

Match each African geographical region listed on the left with its primary demographic density characteristic and environmental driver on the right.

Click a left item, then click its matching right item

Items

Nile River Delta and Valley
Sahara and Namib Deserts
East African Volcanic Highlands
Witwatersrand Industrial Belt

Matches

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Answer

The Nile Delta and Valley pairs with high population density on fertile alluvial soil; Sahara and Namib Deserts pair with low density due to hyper-aridity; East African Highlands pair with high rural density on volcanic soil; and Witwatersrand pairs with high density driven by mineral wealth and industrialization.
Each African region exhibits population densities reflecting its specific natural resource endowment or physical environment: irrigation and alluvium along the Nile Valley, severe water scarcity in the Sahara/Namib, rich volcanic agricultural soils in East African highlands, and mining/industrial urban pull in Witwatersrand.

Step-by-Step Solution

1
Analyze environmental and economic factors influencing population distribution across African regions.
Identify that hyper-arid zones create low density, fertile soils/water bodies create high agricultural density, and mining/industry create high urban density.
Population density in Africa is strongly controlled by water availability, soil fertility, climate, and mineral resources.
2
Pair each region to its corresponding density driver.
Nile Delta and Valley aligns with alluvial soils/river irrigation; Sahara and Namib Deserts align with hyper-aridity; East African Highlands align with volcanic soils/rainfall; Witwatersrand aligns with mining and industry.
This establishes correct matching between regional geography and demographic patterns.

Key Concept

Physical and economic factors controlling population distribution and density in Africa
Question 12656Question →

A meteorological officer at a weather station needs to select the appropriate instruments and standard units of measurement for recording atmospheric pressure and relative humidity. Which pair of instruments and corresponding units should be selected?

Show answer & explanation

Answer: Atmospheric pressure: Barometer (measured in millibars); Relative humidity: Hygrometer (measured in percentage)

Answer

Atmospheric pressure is measured using a barometer in millibars (mb), and relative humidity is measured using a hygrometer in percentage (%).
Atmospheric pressure is the weight of the air column above a given point, measured using a barometer in units of millibars (mb) or hectopascals (hPa). Relative humidity is the ratio of actual water vapor in the air to the maximum amount possible at the current temperature, measured as a percentage (%) using a hygrometer or psychrometer.

Step-by-Step Solution

1
Identify the instrument and unit used for recording atmospheric pressure.
Atmospheric pressure is measured using a barometer, with readings typically expressed in millibars (mb) or hectopascals (hPa).
Atmospheric pressure represents the force exerted by the weight of air per unit surface area.
2
Identify the instrument and unit used for recording relative humidity.
Relative humidity is measured using a hygrometer (such as a dry-and-wet bulb psychrometer), expressed as a percentage (%).
Relative humidity measures the amount of moisture present in the air compared to the maximum amount the air can hold at that specific temperature.
3
Select the option that correctly pairs both weather elements with their respective instruments and units.
The option pairing atmospheric pressure with the barometer (millibars) and relative humidity with the hygrometer (percentage) is correct.
Each weather element is correctly aligned with its standard measuring device and unit.

Key Concept

Weather Elements, Measuring Instruments, and Units
Estimated Time:1m 0s
Question 12657Question →

Match each Köppen climate classification symbol on the left with its corresponding atmospheric control mechanism and seasonal precipitation regime on the right.

Click a left item, then click its matching right item

Items

AfAf
AmAm
CsCs
BWkBWk

Matches

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Answer

AfAf matches continuous year-round ITCZ rainfall; AmAm matches marked seasonal monsoonal rain with a brief dry season; CsCs matches summer drought from subtropical highs and winter rain from westerlies; BWkBWk matches mid-latitude desert aridity from continentality and rain shadows.
Each Köppen symbol accurately maps to its driving atmospheric control: AfAf relies on perpetual equatorial ITCZ uplift; AmAm depends on seasonal monsoonal wind reversals; CsCs is governed by the seasonal migration of subtropical high-pressure cells and mid-latitude westerlies; and BWkBWk is created by rain shadows and continental isolation at middle latitudes.

Step-by-Step Solution

1
Analyze the thermal and moisture parameters represented by each Köppen climate code.
Identify that AA represents tropical climates, CC represents warm temperate climates, and BB represents arid climates.
Establishing primary climate groups establishes the primary latitude and temperature bounds for matching.
2
Match the second-letter modifiers (ff, mm, ss, WW) and third-letter temperature modifier (kk) to seasonal precipitation patterns.
ff indicates fully humid year-round, mm indicates monsoonal rain, ss indicates dry summer, and WkWk indicates cold desert conditions.
The lower-case secondary letters specify the exact rainfall regime and seasonal controls.
3
Pair each symbol with its corresponding atmospheric mechanism.
AfAf pairs with ITCZ convergence, AmAm with seasonal onshore monsoon flows, CsCs with subtropical subsidence and westerly winter shifts, and BWkBWk with continentality and rain-shadow effects.
Atmospheric pressure belts and ocean-continent positions dictate the physical controls behind each climate type.

Key Concept

Köppen Climate Classification and Controlling Atmospheric Mechanisms
Question 12658Question →

Which of the following regional economic groupings was established primarily to promote economic integration, trade cooperation, and the free movement of goods and people among countries located in West Africa?

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Answer: Economic Community of West African States (ECOWAS)

Answer

Economic Community of West African States (ECOWAS)
The Economic Community of West African States (ECOWAS) was established by the Treaty of Lagos in 1975 to foster economic self-sufficiency, trade cooperation, and free movement of goods and persons specifically across West African member states.

Step-by-Step Solution

1
Identify the geographical region specified in the prompt
The target region is West Africa.
The question asks for the economic grouping operating primarily within West African nations.
2
Evaluate the regional mandates of the given economic blocs
ECOWAS covers West Africa, SADC covers Southern Africa, EAC covers East Africa, and UMA covers North Africa.
Matching each economic bloc to its respective sub-regional geographic coverage identifies the correct organization.

Key Concept

Regional Economic Groupings in Africa
Question 12659Question →

In humid tropical regions experiencing high temperatures and heavy seasonal rainfall, intense leaching removes silica and soluble bases from the soil profile while leaving behind insoluble hydrated oxides of iron and aluminum. Which pedogenic process is responsible for this soil development?

Show answer & explanation

Answer: Lateritization

Answer

Lateritization
Lateritization is the dominant soil-forming process in humid tropical and sub-tropical climates with high rainfall and warm temperatures. Rapid chemical weathering and intense leaching remove soluble silica and bases from the topsoil, leaving behind resistant, insoluble iron and aluminum sesquioxides that produce reddish lateritic soils.

Step-by-Step Solution

1
Analyze the climatic context and chemical mechanism described in the stem.
High temperatures and heavy rainfall in humid tropics promote intense leaching (eluvial removal of silica and soluble salts).
Climatic controls dictate the specific weathering and pedogenic pathways in soil profile development.
2
Identify the resulting mineral accumulation.
Residual accumulation of insoluble hydrated oxides of iron (Fe) and aluminum (Al), giving tropical soils their characteristic reddish oxide crust.
Desilication removes silica compounds, concentrating insoluble sesquioxides in the profile.
3
Match the process with its corresponding pedogenic term.
The process described is lateritization (ferralitization), resulting in lateritic soil/oxisol formation.
Lateritization is the precise pedogenic term for sesquioxide enrichment via tropical desilication.

Key Concept

Lateritization and Tropical Soil Pedogenic Processes
Question 12660Question →

Geological analysis of the Earth's crust reveals distinct compositional and physical differences between continental and oceanic sectors. Which of the following statements accurately describes the relationship between the sial and sima layers?

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Answer: Sial is rich in silica and aluminium, forming a lighter granitic layer that floats upon the denser basaltic sima layer composed of silica and magnesium.

Answer

Sial is rich in silica and aluminium, forming a lighter granitic layer that floats upon the denser basaltic sima layer composed of silica and magnesium.
The sialic layer (silica and aluminium) forms the lighter continental crust with an average density of 2.7 g/cm³, resting directly above the denser simaic layer (silica and magnesium, 3.0 g/cm³) which constitutes the oceanic crust and continuous lower crustal foundation.

Step-by-Step Solution

1
Analyze the chemical composition denoted by the names sial and sima.
Sial derives from Silica and Aluminium (granitic composition), whereas Sima derives from Silica and Magnesium (basaltic composition).
These chemical elements form the essential constituent minerals of the upper and lower crust.
2
Determine the relative density and structural positioning of these layers within the lithosphere.
Sial has an average density of 2.7 g/cm³ and forms the upper continental crust, while sima has an average density of 3.0 g/cm³ and forms the oceanic floor beneath sial.
Principle of isostasy dictates that lighter granitic rocks float on top of denser basaltic substrates.

Key Concept

Composition and structural characteristics of the Earth's crust (Sial and Sima)
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