9 (a) Define terms saprolite and regolith. Fig 9.1 below shows regolith depth in different biomes.

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a) Saprolite is chemically weathered bedrock that retains the original rock structure. It is often soft and friable. Regolith is a layer of loose, unconsolidated material covering solid bedrock. It includes soil, dust, broken rock, and other related materials. b) Step 1: Analyze the regolith depth in different biomes from Fig 9.1. The diagram shows that regolith depth varies significantly across different biomes. In the desert, the regolith is very shallow, around 10-20 units (likely meters, given the scale). In the savanna, it is deeper, reaching about 40-60 units. The deepest regolith is found in the tropical rainforest, extending beyond 120 units. Step 2: Relate regolith depth to climate and vegetation. Desert: Characterized by arid climate and sparse vegetation. Chemical weathering is minimal due to lack of water, leading to shallow regolith. Physical weathering (e.g., temperature changes) might break down rocks, but the lack of moisture limits deep soil formation. Savanna: Experiences seasonal rainfall and has grasslands with scattered trees. The increased moisture compared to deserts allows for more chemical weathering, resulting in deeper regolith. Vegetation contributes organic matter, aiding soil development. Tropical Rainforest: Features a hot, humid climate with dense, lush vegetation. High temperatures and abundant rainfall promote intense chemical weathering, leading to very deep saprolite and regolith formation. The extensive root systems of rainforest vegetation also contribute to weathering and soil development. c) Agricultural activities in tropical areas can significantly affect regolith in several ways: Deforestation and land clearing: Removing natural vegetation exposes the regolith to direct rainfall and sunlight, increasing soil erosion and leaching of nutrients. This can lead to a reduction in regolith depth and fertility. Tillage and cultivation: Ploughing and other farming practices disturb the soil structure, making it more susceptible to compaction and erosion. This can degrade the physical properties of the regolith. Monoculture and chemical use: Planting single crops repeatedly can deplete specific nutrients, while the use of fertilizers and pesticides can alter the chemical composition and microbial activity within the regolith, affecting its long-term health and productivity. Irrigation: Improper irrigation can lead to salinization (accumulation of salts) in the regolith, especially in areas with high evaporation rates, making the land unsuitable for agriculture.

9 (a) Define terms saprolite and regolith. Fig 9.1 below shows regolith depth in different biomes.

Step-by-step solution

Part a

Part b· 2 steps

Analyze the regolith depth in different biomes from Fig 9.1.

Relate regolith depth to climate and vegetation.

Part c

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