Consider the following statements:Statement I: In the context of effect of water on rocks, chalk is

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UPSC Prelims is a competitive examination conducted in India. This question is from the 2025 UPSC Prelims Geography paper.

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This UPSC Prelims 2025 Geography question has a hard difficulty level.

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Question

Consider the following statements:Statement I: In the context of effect of water on rocks, chalk is known as a very permeable rock whereas clay is known as quite an impermeable or least permeable rock.Statement II: Chalk is porous and hence can absorb water.Statement III: Clay is not at all porous.Which one of the following is correct in respect of the above statements?

Accepted Answer

Correct Answer: C - Only one of the Statements II and III is correct and that explains Statement IStep-by-step Solution:Statement I: Chalk is permeable while clay is relatively impermeable. This is correct.Statement II: Chalk is porous and absorbs water. This is correct and explains why chalk is permeable, as water can pass through its pore spaces.Statement III: This is incorrect. Clay is not 'non-porous'. In fact, clay has high porosity due to very fine particles, but its pores are extremely small and poorly connected, making it impermeable.Conclusion: Only Statement II is correct and it explains Statement I.Key Concept: Porosity vs Permeability — Clay has high porosity but low permeability; chalk has both porosity and permeability (especially due to fractures).

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More Questions from Landforms – Mountains, Plateaus, Plains & Geomorphology

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More Questions from Landforms – Mountains, Plateaus, Plains & Geomorphology

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