UPSC 2025: 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?

The correct answer is option (c): Only one of the Statements II and III is correct and that explains Statement I. Watch the detailed video explanation in our Sherlocking Prelims course on UnlockIAS.

This question was asked in UPSC CSE Prelims 2025, GS Paper 1, as Question 28. It falls under Geography > Physical Geography & Geomorphology.

This question is rated "moderate". It requires sound conceptual understanding of the topic.

UPSC has asked 26 questions from Physical Geography & Geomorphology (under Geography) across multiple years. Visit the topic page to see the full list and year-wise trends.