Question

how are sand dumes formed​

Answer 1

Answer:

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.

Answer 2

Sand dunes are formed when the sand in deserts are washed away by air and end up piling in the same place forming larger hills of sand which are known as sand dunes