Question

What are dunes made up of give one example of dunes

Answer 1

dunes are made up of sand

Answer 2

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.
Examples of dunes are -

longitudinal dunes. Narrow elongated dunes that form when the wind blows in two convergent directions.

transverse dunes. ...

chain of dunes. ...

parabolic dune. ...

complex dune. ...

crescentic dune.

Hope it helps you !!!!