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

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

Explanation:

An alluvial fan is a fan- or cone-shaped heap of sediment mixed and built up by currents. If a fan is built up by debris flows it is properly named a debris cone or colluvial fan. The sediment left behind that forms the alluvial fan is called alluvium. Alluvial fans are generated when water and sediments pass within a narrow gap between hills, mountains or canyon walls and then slows down and flattened out when it relinquishes an open plain.

answer at the divergent plate boundary in the middle of the ocean;

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