Question

How are sand dunes formed? What are their typical shapes? Why are they not permanent in nature?¿?¿?​

Answer 1

How are sand dunes formed? What are their typical shapes? Why are they not permanent in nature?

➜ Sand dunes are generally formed by the movement of winds. They are highly influenced by the speed of wind, nature of the surface, etc.

➜ Shapes include moon shaped, long narrow shaped, ridge shaped, parallel base shaped.

➜ They are not permanent because they are continuously getting moved, reshaped and redeposited.

Answer 2

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A dune is a mound of sand formed by the wind, usually along the beach or in a desert. Dunes form when wind blows sand into a sheltered area behind an obstacle. Dunes grow as grains of sand accumulate. Every dune has a windward side and a slipface.