Question

what is sand dunes ?​

Answer 1

Answer:

When the wind blows, it lifts and transports sand from one place to another. When the wind stops blowing, the sand falls and gets deposited in the low hill-like structures. These are called sand dunes.

Answer 2

Answer:

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. ... Underwater dunes, called subaqueous dunes, are common in the ocean, rivers, and canals.