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?
Explanation
Statement I: Correct Chalk is permeable (water passes easily); clay is impermeable (water passes poorly).
Statement II: Correct Chalk is porous, with many small holes that hold water, making it permeable.
Statement III: Incorrect Clay is porous but with very tiny pores that restrict water flow; it is impermeable but not non-porous.
Correct Answer: Only Statements I and II are correct; Statement II explains Statement I.