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Question
The riverbank is weakest where the river turns. This is because water
Options:
A .  reacts more effectively with the bank at a turn
B .  flows faster as it turns
C .  gets concentrated on the inner bank of the turn, making it denser
D .  effectively bounces off the outer bank as it turns exerting an extra pressure on the bank
Answer: Option D
Answer: (d)Water effectively bounces off the outer bank as it turns exerting an extra pressure on the bank. This is why the river bank is weakest where the river turns.

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