How is delta form? Explain with the help of diagram
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 it flow towards its mouth (a place where a river drain into a lake, sea or an ocean).
When a river reaches a lake or the sea towards the end of its journey, the water slows down and loses the power to carry sediment. The sediment is thus deposited at the mouth of the river. Some rivers deposits huge quantities of sediment which cannot be carried away by sea waves and tides. This results into the building up of layers forming a delta.