Discussion
Assertion (A): Fine sediment often accumulates near the head of the salt intrusion in an estuary.
Reason (R): Flocculation of clay particles on meeting saline water increases their settling velocity.
Answer: B
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. Clay particles carry a surface charge that keeps them apart in fresh water; saline water screens that charge and lets them stick together into flocs, whose settling velocity is many times that of the individual particles. They therefore drop out where the fresh and salt water meet, forming the turbidity maximum and the mud shoals that make estuarine navigation channels so expensive to maintain.
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