Discussion
Assertion (A): Hard defences can cause the loss of saltmarsh in front of them.
Reason (R): Rising sea level would move the marsh landward but the defence prevents it.
Answer: D
Correct answer: Both A and R are true, and R is the correct explanation of A
Both are true and the reason describes coastal squeeze. A saltmarsh survives sea level rise by moving landward, and a defence at its back removes that possibility, so the marsh narrows and eventually disappears - taking with it the wave attenuation it provided to the defence itself. The defence therefore destroys part of its own protection, which is one of the strongest arguments for realignment.
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