Question

what is sand dunes ? ​

Answer 1

A dune is a landform, and is a large mass of wind-blown sand. Dunes are most common in deserted environments, such as the Sahara, and also near beaches. An area with dunes is called a dune system. In physical geography, a dune is a hill of loose sand built by aeolian processes or the flow of water.

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Answer 2

$\orange \bigstar \: \huge\sf \green{Sand \: Dunes}$

A hill of sand near an ocean or in a desert formed by wind.