A fan-shaped pile of sediment deposited at a stream's mouth is a

Question

Quizplus · Accepted Answer

Both a delta and an alluvial fan are fan-shaped piles of sediment, but a delta is specifically formed at the mouth of a river where it meets a larger body of water (like an ocean) while an alluvial fan is formed at the base of a mountain or hilly area where water and sediment flow down and spread out at the bottom. Therefore, both A and B could describe a fan-shaped pile of sediment deposited at a stream's mouth or at the base of a mountain, respectively.

A Fan-Shaped Pile of Sediment Deposited at a Stream's Mouth