Choose the best answer.

_______________ is seen in the lower course of river.

The lower course marks the journey of river mainly in the plains loaded with sediments, minerals and huge amounts of debris. This debris is deposited and accumulated in the low-lying river beds resulting in the formation of very fertile soil. This deposition and accumulation of components result in the formation of deltas. Typically, deltas will be triangular shaped that is formed at the low-lying mouth of rivers. It will contain huge volumes of mineral and sediment deposits. The Ganga-Brahmaputra delta is the largest in the world.