Question

what is dune and how it is created​

Answer 1

Explanation:

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.

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Answer 2

Answer:

Sand dunes are ridges or hills of sand found at the top of a beach, above the usual maximum reach of the waves.

Sand dunes are created when wind deposits sand on top of each other until a small mound starts to form. Once that first mound forms, sand piles up on the windward side more and more until the edge of the dune collapses under its own weight.