Question

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

Answer 1

Because at upper coarse the speed is high and it starts to cut anything in its path and at lower coarse the speed is low so it starts to distribute in many directions... And distribute useful sediments helpful for crop.... Hope it helps...
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Answer 2

Answer:

Explained as below

Explanation:

• As the river is full of energy at its mouth or opening the river has a higher discharge rate and water is pushed forceful outwards from its upper reaches. As the upper course is steeper and is strong volume of water downwards under the action of gravity.

• The lower courses of the river are much shallower and fewer rapids the energy is dissipated into surrounding water and river now has lower carrying capacity seen in terms of flat-bottomed valleys and low lying floodplains along with deltas formations.

• The upper courses of a river can be seen in the form of steep-V-shaped valleys, various spurs, rapids, and gorges. While the Middle course river features include wider, shallow valleys, mature meanders, and oxbow lakes.