A river delta is a landform created by deposition of sediment that is carried by a river as the flow leaves its mouth and enters slower-moving or stagnant water. This occurs where a river enters an ocean, sea, estuary, lake, reservoir, or (more rarely) another river that cannot carry away the supplied sediment.

How is delta formed?

Deltas are wetlands that form as rivers empty their water and sediment into another body of water, such as an ocean, lake, or another river. ... A river moves more slowly as it nears its mouth, or end. This causes sediment, solid material carried downstream by currents, to fall to the river bottom.

How are deltas formed Class 9?

A delta is a triangular piece of land which is found at the mouth of a river. It is formed when a river deposits the sediments as the flow leaves its mouth.