Downcutting is usually most prominent along the ________ part of a stream valley.

Name: Downcutting is usually most prominent along the ________ part of a stream valley.
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Downcutting is the process by which a stream cuts vertically downwards, creating a deeper stream bed. It is usually most prominent along the upper part of a stream valley, where the gradient is steeper and the stream has a greater capacity to transport sediment. Therefore, the best choice is B, upper.

Downcutting Is Usually Most Prominent Along the ________ Part of a Stream