Question

Sand dunes form when:

Answer 1

Answer:

When put against the wind

Explanation:

Dunes form when wind blows sand into a sheltered area behind an obstacle. Dunes grow as grains of sand accumulate. Every dune has a side that faced the wind, and a side that is protected from the wind.

Answer 2

Answer:

sand dunes are huge sand structures which are formed by the action of wind in a desert.

the strong winds blowing in the deserts settles down the sand at some places, and due to this settlement it get bigger and forms sand dunes.