what are sand dunes?
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sand dunes are small hills of sand usually found in desert areas .These are formed due to movement of wind.
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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. The dynamic action of wind and water can sometimes causes the dunes to drift,
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