Discussion
Assertion (A): Distinguishing storm response from long term trend is essential in coastal monitoring.
Reason (R): A beach may recover fully from a storm while still retreating over decades.
Answer: A
Correct answer: Both A and R are true, and R is the correct explanation of A
Both are true and the reason gives the difficulty. A single storm can cut a beach back dramatically and the beach can rebuild fully over the following months, so a survey taken just afterwards shows an alarming loss that means nothing. Conversely a slow retreat of half a metre a year is invisible in any one year and is what actually threatens the frontage. Only a record of a decade or more separates the two.
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