A sand dune typically has a crescent, ridge or mound-like shape. Formed by wind in desert regions, dunes have a gentle slope on one side and a steeper slope on the other. Their shape changes over time due to shifting ...
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A sand dune typically has a crescent, ridge or mound-like shape. Formed by wind in desert regions, dunes have a gentle slope on one side and a steeper slope on the other. Their shape changes over time due to shifting ...