How Is an Alluvial Fan Formed

question 71

Multiple Choice

How is an alluvial fan formed?

• A)A stream erodes down through older terraces and entrenched meanders.
• B)Sediment is deposited by debris flows and streams that decrease in velocity along the mountain front.
• C)A landslide blocks the stream,causing sediment to accumulate upstream.
• D)A dam increases the speed of currents below the dam.

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