HOTS

The river channels in the lower course are wider than the upper course.

The river falls down from the steep mountain slopes and cliffs. Higher the steep of the mountain, higher will be the speed and pace of the fall and greater will be the force to broaden and extend the river valley resulting in erosion of many elements. V-shaped valleys, gorges, waterfalls, canyons and rapids are the major features associated with this course. In the middle course, the river passes through the sloping plains and valleys along with the particles and components like sand, slits, sediments, minerals and other elements. Actions of erosion and transportation take place in the middle course. The river widens and reduces in speed because of the particles that it carries. Alluvial fans, floodplains, meanders and ox-bow lakes are the major features associated with this course. 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. Here the main river will get split into a number of different river channels known as distributaries. This deposition and accumulation of components result in the formation of deltas and estuary. Thus, the silt, sediments and other particles carried by the river is responsible for its widening in the lower course.