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Where can features like alluvial fans form in Himalayan rivers?

Answer and explanation

Correct answer: Near the point where rivers enter plains from mountains

Direct answer: A, near the point where rivers enter plains from mountains. An alluvial fan forms when a stream leaves a steep, narrow mountain valley and reaches a flatter area. Its speed and carrying power decrease, so sand, gravel and silt spread outward in a fan shape. A is correct and describes the mountain-foot zone. B is wrong because an alluvial fan is a land feature, not something formed in the middle of the sea. C is wrong because it is not restricted to volcanic craters. D is wrong because desert dunes are wind deposits, not the required river deposit. Memory cue: sudden slope decrease causes fan-shaped deposition.

Related tags

Alluvial FansFoothillsHimalayan Rivers

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