How Is an Alluvial Fan Formed

question 93

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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