Question

Define what is Alluvial fans?

Answer 1

An alluvial fan is a triangle-shaped deposit of gravel, sand, and even smaller pieces of sediment, such as silt. This sediment is called alluvium. Alluvial fans are usually created as flowing water interacts with mountains, hills, or the steep walls of canyons.

Answer 2

Hello friend

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When a river enters the plain area after crossing the mountainous area,its speed reduces drastically and the sediments brought down with it get deposited at the river bed.

This deposition looks like a fan and therefore,it is called as Alluvial fans.This Alluvial fans can be seen in semi arid region.

At the foothills of the Himalayas,esp.after crossing the Siwalik ranges ,rivers enter the North Indian plains .Such plains are formed here.

eg.Alluvial fans formed by river kosi.

Thanks.

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