Question

what are sand dunes​

Answer 1

Answer:

A sand dune is a landform, and is a large mass of wind-blown sand. Sand dunes are most common in deserted environments, such as the Sahara, and also near beaches. An area with dunes is called a dune system. The dynamic action of wind and water can sometimes causes the sand dunes to drift, which can have serious consequences

Answer 2

Answer:

Sand dunes are the small hills or mountains that are found in deserts. These are generally formed by the wind, distributing the sand in-evenly over the whole desert area. Sometimes, water is also the cause of formation of dunes. The five types of sand dunes are -

1. Crescentic

2. Linear

3. Star

4. Dome

5. Parabolic

Hope this helps