Question

How are sand dunes formed​

Answer 1

Answer:

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.

Answer 2

Answer:

The conditions required for sand dunes to form include:

1. A large supply of sand

2. A large flat beach

3. Time for sand to dry, so a large tidal range is needed.

4. An onshore wind (wind blowing from the sea to the land) for sand to be moved to the back of the beach.

5. An obstacle for the dune to form against e.g pebble or driftwood.

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