Discussion
Assertion (A): Damming a river is a common indirect cause of coastal erosion.
Reason (R): The reservoir traps the sediment load that formerly nourished the shoreline.
Answer: D
Correct answer: Both A and R are true, and R is the correct explanation of A
Both are true and the reason gives the mechanism. A dam traps the sediment the river was carrying to the coast, so the beaches downdrift of the river mouth lose an input they had depended on for centuries and begin to erode - often decades later and many kilometres away, which is why the connection is so easily missed. The Nile delta after the Aswan High Dam is the classic case.
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