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Where are features like alluvial fans likely to form in Himalayan rivers?

Answer and explanation

Correct answer: Near the entry from mountains to plains

Direct answer: D, near the entry from mountains to plains. An alluvial fan is a fan-shaped deposit made when a river leaves a steep mountain valley and enters flatter land. In the mountains, the slope is steep, so water flows quickly and carries stones, sand and silt. At the foothills the slope suddenly becomes gentler; the river loses speed and spreads its load outward in a fan shape. Therefore D is correct. A is wrong because a deep sea is not the usual place for a fan at the mountain front. B is wrong because this question concerns a change from mountain slope to plain, not a desert. C is wrong because an alluvial fan is deposited outside a glacier by running water, not inside ice. Memory cue: steep slope plus sudden gentle slope means deposition and alluvial fan.

Related tags

Alluvial FansFoothillsDeposition

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