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A Level H2 Geography Physical Geography Quiz

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A-Level Geography H2 Quiz - Physical Geography

Name: __________________________
Class: __________________________
Date: ___________________________
Score: _________ / 60

Duration: 60 Minutes
Total Marks: 60
Topic: Physical Geography (Tropical Environments & Geomorphology)

Instructions:

Answer all 20 questions.
Marks for each question are indicated in brackets [ ].
Use specific geographical terminology and, where appropriate, refer to the provided resources or your own case study knowledge.
For data-response questions, ensure you quote specific figures from the resources to support your answers.

Section A: Tropical Climates and Ecosystems (Questions 1–5)

Resource 1 shows the climate data for two stations: Station A (Manaus, Brazil) and Station B (Kano, Nigeria).

Month	J	F	M	A	M	J	J	A	S	O	N	D	Annual Total
Station A Temp (°C)	26	26	26	26	26	26	26	27	27	27	26	26	-
Station A Rain (mm)	260	280	300	300	250	150	100	80	120	180	200	240	2460
Station B Temp (°C)	24	26	29	31	30	28	26	25	26	27	26	24	-
Station B Rain (mm)	0	0	10	40	110	180	200	220	140	30	0	0	930

1. Identify the Köppen-Geiger climate classification for Station A. Support your answer with two pieces of evidence from Resource 1. [3]

2. Identify the Köppen-Geiger climate classification for Station B. Support your answer with two pieces of evidence from Resource 1. [3]

3. Explain why the annual temperature range at Station B (Kano) is significantly larger than at Station A (Manaus). [2]

4. Describe the likely vegetation structure of the ecosystem found at Station A. Refer to at least three distinct vertical layers. [3]

5. Explain how the seasonal rainfall pattern at Station B influences the adaptation strategies of local vegetation (e.g., deciduousness, root systems). [4]

Section B: Tropical Geomorphology and Soils (Questions 6–10)

6. Define the term laterization in the context of tropical soil formation. [2]

7. Explain the process of hydrolysis and its role in the chemical weathering of granite in humid tropical environments. [4]

8. Study the description below: "A landscape characterized by steep-sided limestone towers, sinkholes (dolines), and underground cave systems." Identify this landscape type and name the primary rock type associated with it. [2]

9. Explain how carbonation contributes to the formation of the landscape identified in Question 8. Include a chemical equation or description of the reaction. [4]

10. Compare the permeability of Oxisols (typical tropical rainforest soils) with Andisols (volcanic soils). How does this difference affect surface runoff potential? [3]

Section C: Mass Movements and Hazards (Questions 11–15)

Resource 2 describes a mass movement event in a tropical highland region following a period of intense monsoon rainfall. The slope consists of deep, weathered regolith overlying impermeable bedrock.

11. Identify the specific type of mass movement likely to occur in the scenario described in Resource 2, where saturated soil moves rapidly down a slope as a viscous fluid. [1]

12. Explain the role of pore water pressure in triggering the mass movement identified in Question 11. [3]

13. Distinguish between a rockfall and a rotational slump in terms of: (a) The nature of the movement. (b) The typical material involved. [4]

14. Suggest two human activities that can increase the risk of mass movements in tropical urbanizing areas. [2]

15. Evaluate the effectiveness of bio-engineering (e.g., planting vetiver grass) compared to hard engineering (e.g., concrete retaining walls) in mitigating shallow landslides on tropical slopes. [4]

Section D: Synthesis and Evaluation (Questions 16–20)

16. "High temperatures are the primary driver of chemical weathering rates in the tropics." To what extent do you agree with this statement? Consider the role of moisture. [4]

17. Explain why tropical rainforest ecosystems are often described as having "nutrient-poor soils" despite supporting lush, dense vegetation. Refer to the concept of nutrient cycling. [4]

18. Analyze how deforestation in tropical environments can alter the local hydrological cycle, specifically focusing on interception and infiltration rates. [4]

19. Compare the challenges of agricultural sustainability in Tropical Rainforest (Af) regions versus Tropical Monsoon (Am) regions. Focus on soil fertility and water availability. [4]

20. "Climate change will lead to an expansion of Tropical Savanna (Aw) climates at the expense of Tropical Rainforest (Af) climates." Discuss the potential geomorphological impacts of this shift on landscape processes (e.g., weathering, erosion). [4]

Answers

A-Level Geography H2 Quiz - Physical Geography (Answer Key)

Total Marks: 60

Section A: Tropical Climates and Ecosystems

1. Identify the Köppen-Geiger climate classification for Station A. Support with two pieces of evidence. [3]

Identification: Tropical Rainforest (Af). [1]
Evidence 1: All monthly rainfall totals are above 60mm (no dry season). [1]
Evidence 2: Mean monthly temperatures are consistently high (>18°C, specifically ~26-27°C) with a very low annual range. [1]
- Note: Accept "High annual total >2000mm" as secondary evidence for Af if linked to no dry season.

2. Identify the Köppen-Geiger climate classification for Station B. Support with two pieces of evidence. [3]

Identification: Tropical Savanna (Aw). [1]
Evidence 1: Distinct dry season where monthly rainfall is below 60mm (e.g., Dec-Mar are 0-10mm). [1]
Evidence 2: High temperatures year-round (>18°C), but with a higher annual range than Station A. [1]

3. Explain why the annual temperature range at Station B is larger than at Station A. [2]

Station B has a distinct dry season with clear skies, allowing for greater solar insolation heating in summer and rapid terrestrial radiation cooling in winter/dry months. [1]
Station A has consistent cloud cover and high humidity year-round, which moderates temperatures (greenhouse effect at night, reflection during day), reducing the range. [1]

4. Describe the likely vegetation structure at Station A. Refer to three vertical layers. [3]

Emergent Layer: Scattered, very tall trees (40-50m) rising above the canopy. [1]
Canopy Layer: Dense, continuous layer (20-30m) that intercepts most sunlight and rain. [1]
Understory/Shrub Layer: Sparse vegetation due to low light penetration; consists of shade-tolerant shrubs and young trees. [1]
- Accept Ground Layer (very sparse, mostly decomposing litter) as an alternative.

5. Explain how seasonal rainfall at Station B influences vegetation adaptations. [4]

Deciduousness: Trees shed leaves during the dry season to reduce transpiration and water loss. [1]
Root Systems: Deep taproots develop to access groundwater tables that remain deep below the surface during the dry months. [1]
Thick Bark: Protects trees from frequent savanna fires that occur during the dry season due to dried grass fuel. [1]
Water Storage: Some plants (succulents/baobabs) store water in trunks/roots to survive the prolonged dry period. [1]

Section B: Tropical Geomorphology and Soils

6. Define laterization. [2]

It is a soil formation process in hot, wet tropical climates. [1]
It involves intense leaching of silica and bases (Ca, Mg, K), leaving behind a concentration of insoluble iron and aluminium oxides (sesquioxides) in the soil profile. [1]

7. Explain the process of hydrolysis and its role in weathering granite. [4]

Process: Rainwater absorbs CO2 to form weak carbonic acid, which dissociates into H+ ions. [1]
Reaction: These H+ ions replace cations (like K+, Ca2+) in silicate minerals (e.g., feldspar) in the granite. [1]
Result: This destabilizes the mineral structure, converting feldspar into clay minerals (e.g., kaolinite) and soluble salts. [1]
Impact: The rock structure weakens and disintegrates into deep regolith/saprolite. [1]

8. Identify the landscape and rock type. [2]

Landscape: Karst Landscape. [1]
Rock Type: Limestone (or Carbonate rock/Chalk). [1]

9. Explain how carbonation contributes to Karst formation. Include reaction. [4]

Process: Rainwater combines with atmospheric/soil CO2 to form carbonic acid ( $H_2CO_3$ ). [1]
Reaction: Carbonic acid reacts with Calcium Carbonate ( $CaCO_3$ $C a C O_{3}$ ) in limestone to form soluble Calcium Bicarbonate ( $Ca(HCO_3)_2$ $C a (H C O_{3})_{2}$ ). [1]
- Equation: $CaCO_3 + H_2O + CO_2 \rightarrow Ca(HCO_3)_2$
Mechanism: This solution process enlarges joints and bedding planes in the limestone. [1]
Feature Formation: Over time, this creates surface features (grikes, clints, sinkholes) and subsurface features (caves, caverns). [1]

10. Compare permeability of Oxisols and Andisols and effect on runoff. [3]

Oxisols: Often have a stable granular structure but can become compacted; however, deep weathering usually allows good infiltration unless surface crusting occurs. Generally moderate-high infiltration. [1]
Andisols: Volcanic soils are highly porous and have very high permeability/infiltration rates due to volcanic ash structure. [1]
Runoff: Andisols generate less surface runoff than Oxisols (assuming no saturation), as water drains rapidly through the porous volcanic material. Oxisols may generate more runoff if the surface seal forms or if the water table is high. [1]

Section C: Mass Movements and Hazards

11. Identify the mass movement. [1]

Mudflow (or Debris Flow / Earthflow). [1]

12. Explain the role of pore water pressure. [3]

Heavy rainfall infiltrates the soil, filling pore spaces between particles. [1]
This increases pore water pressure, which pushes soil particles apart and reduces friction/cohesion between them. [1]
The increased pressure reduces the shear strength of the slope material, causing it to fail and flow when gravity exceeds resistance. [1]

13. Distinguish between rockfall and rotational slump. [4]

(a) Nature of Movement:
- Rockfall: Free-falling, bouncing, or rolling of detached rock fragments through the air. [1]
- Rotational Slump: Downward and outward movement of a coherent mass of material along a curved (concave) slip plane. [1]
(b) Typical Material:
- Rockfall: Hard, jointed rock (e.g., Granite, Limestone). [1]
- Rotational Slump: Unconsolidated material, clay, or weak rock (e.g., Boulder Clay, Shale) often saturated with water. [1]

14. Suggest two human activities increasing mass movement risk. [2]

Deforestation/Removal of Vegetation: Removes root binding and increases soil saturation via reduced interception. [1]
Road Cutting/Construction: Undercuts the toe of the slope, removing support and steepening the angle beyond the angle of repose. [1]
- Accept: Overloading slope with buildings, poor drainage installation.

15. Evaluate bio-engineering vs. hard engineering for shallow landslides. [4]

Bio-engineering (Vetiver Grass):
- Pros: Cost-effective, environmentally friendly, roots bind surface soil effectively against shallow slips. [1]
- Cons: Takes time to establish, less effective for deep-seated failures or high-magnitude events. [1]
Hard Engineering (Concrete Walls):
- Pros: Immediate protection, high strength against significant forces. [1]
- Cons: Expensive, visually intrusive, can disrupt natural drainage leading to pressure buildup behind walls, high maintenance. [1]
- Evaluation: Bio-engineering is often preferred for sustainable, low-cost mitigation of shallow slides, while hard engineering is reserved for high-value infrastructure at risk of deeper failure.

Section D: Synthesis and Evaluation

16. "High temperatures are the primary driver of chemical weathering." To what extent? [4]

Agree: High temperatures increase the kinetic energy of molecules, accelerating chemical reaction rates (e.g., hydrolysis, oxidation). [1]
Qualification: However, moisture is equally critical; without water, chemical reactions (like hydrolysis/carbonation) cannot occur regardless of temperature. [1]
Synthesis: It is the combination of high heat and abundant moisture (high $Q_{10}$ effect) that drives rapid weathering. [1]
Counter-point: In hot arid tropics, weathering is slow despite heat, proving moisture is the limiting factor, not just temperature. [1]

17. Why are tropical rainforest soils nutrient-poor despite lush vegetation? [4]

Leaching: High rainfall causes intense eluviation, washing away soluble nutrients (bases like Ca, Mg, K) from the topsoil. [1]
Rapid Decomposition: Hot, humid conditions accelerate bacterial/fungal activity, breaking down litter quickly. [1]
Nutrient Cycling: Nutrients are stored primarily in the biomass (vegetation) rather than the soil. [1]
Uptake: Plant roots rapidly absorb released nutrients before they can bind to soil particles, leaving the soil itself infertile (Oxisol). [1]

18. How does deforestation alter the hydrological cycle (interception/infiltration)? [4]

Interception: Removal of canopy eliminates interception storage; rainfall hits the ground directly with higher kinetic energy. [1]
Infiltration: Loss of root structures and organic matter reduces soil porosity; surface compaction (from rain impact/machinery) reduces infiltration capacity. [1]
Result: Increased surface runoff (overland flow) and decreased throughflow/groundwater recharge. [1]
Impact: Higher peak discharge in rivers, increased flood risk, and reduced dry-season base flow. [1]

19. Compare agricultural sustainability challenges: Af vs. Am regions. [4]

Af (Rainforest):
- Challenge: Nutrient-poor soils (Oxisols); sustainability relies on maintaining forest cover for nutrient cycling. Shifting cultivation leads to rapid degradation if fallow periods are shortened. [1]
- Water: Consistent water supply is an advantage, but leaching is a constant threat. [1]
Am (Monsoon):
- Challenge: Seasonal water scarcity; irrigation is required for dry-season cropping. [1]
- Soil: Often slightly more fertile due to less intense leaching in dry season, but risk of salinization if irrigation is poorly managed. [1]
- Comparison: Af struggles with soil fertility maintenance; Am struggles with water management seasonality.

20. Discuss geomorphological impacts of Af shifting to Aw. [4]

Weathering Shift: Reduction in chemical weathering (hydrolysis) due to lower annual moisture; increase in physical weathering (thermal expansion/contraction) during dry seasons. [1]
Erosion Changes: Vegetation cover decreases (forest to grassland), leading to higher surface erosion rates and soil loss during intense monsoon rains. [1]
Landform Evolution: Slower formation of deep saprolite/regolith profiles; potential for increased gully erosion due to lack of root binding in dry seasons. [1]
River Regimes: More variable river discharge (flashy hydrographs) leading to higher competence/capacity during wet seasons but dry channels in dry seasons, altering fluvial landform development. [1]