Acone of debris deposited by running water at the mouth of a canyon in an arid area is known as ?

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Your question: A cone of debris deposited by running water at the mouth of a canyon in an arid area is known as?

Your  A cone of debris deposited by running water at the mouth of a canyon in an arid area is known as alluvial fans.

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Deposition is the transition of matter going from gas to solid without passing through the liquid phase.a.) gas—-> solid