Question

Alluvial fans are composed of material built up from sediment from the foot of the mountains to the valley floor. they are evidence that __________.

Answer 1

Alluvial fans are evidence that the Death Valley is a tectonically active region.

Step-by-step explanation:

• Alluvial fans can be only formed by the slow and gradual depositional action of a river.

• But for an alluvial to be formed, it is primarily necessary for the river to continuously carry and deposit sediments for a long period of time.

• The supply of sediments done by the Death Valley in California provides evidence that it is a tectonically active region.