Question

how does a delta formed ?

Answer 1

Deltas have a fairly flat section called a delta plain that is above water. The river cuts many small channels through the delta plain. These channels are called distributaries. New sections of delta build up at the mouths of the distributaries.

The rest of the delta is under water . There is a steeply sloping delta front that faces the lake or ocean. The prodelta is furthest away from the mouth of the river and is deepest under water.