Answer
V-shaped valleys often contain rapids and/or waterfalls because of the rapid downcutting of the stream. In V-shaped valleys, the stream primarily erodes downward, cutting into the bedrock or loose sediment. The steep sides of the valley result from the erosional action of the flowing water, which continuously deepens the valley. As a result, rapids and waterfalls may form where the stream encounters resistant rock layers or changes in the gradient, causing more pronounced variations in flow velocity and turbulence.
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