How are sand dunes formed?

Sand dunes are formed when wind carries sand and deposits it in a new place, creating small hills or mounds of sand.

Process of Sand Dune Formation

1. Strong winds pick up loose sand particles from dry surfaces.
2. The sand is carried over long distances.
3. When the wind speed slows down, sand particles settle and collect in one place.
4. Over time, these deposits grow into dunes of different shapes and sizes.

Conditions Required

• Dry and loose sand.
• Strong and steady wind.
• Obstacle like rocks or plants to trap sand.

Types of Sand Dunes

Examples

• Thar Desert in India.
• Sahara Desert in Africa.
• Coastal sand dunes along beaches.