Question

Why are there valleys and gorges along rivers?

Answer 1

Answer:

Parts of streams or rivers can be elevated, along with land, during the process of geologic uplift. As rivers or streams flow across this uplifted surface, waterfalls form. Over time, the power of the waterfall erodes the softer rock layers underneath, causing the original river bed to collapse and create a gorge.

Explanation:

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Answer 2

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