13)How is an alluvial fan formed?    A

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13)How is an alluvial fan formed? 

 

A.)sediment is deposited by debris flows and streams that decrease in velocity along the mountain front

 

b.)a landslide blocks the stream, causing sediment to accumulate upstream

 

C.)a dam increases the speed of currents below the dam

 

d.)a stream erodes down through older terraces and entrenched meanders