Discussion
Assertion (A): Freshening of the North Atlantic could weaken the overturning circulation.
Reason (R): Deep water formation depends on the surface water being dense enough to sink.
Answer: C
Both are true and the reason gives the mechanism, and this is one of the more discussed potential consequences of ice sheet melt in a warming climate. Density is the whole of the mechanism. Sinking requires water dense enough to descend.
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