How are sand dunes formed?

Weathering process

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Landslide

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Winds

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Avalanche

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Solution

The correct option is C Winds
The desert wind carry a lot of sand all around. The sand falls and gets deposited when the wind stops blowing. These deposits look like little hills or mounds. These little hills are sand dunes. Sand dunes are usually temporary structures as the next gust of wind can shift them to another place.

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