Question

Widening of a river valley takes place due to what

Answer 1

Widening of a river valley takes place due to Lateral Erosion.

The middle and the lower stages of a river are the most affected parts due to lateral erosion.

This happens due to the simple reason that in the middle course water attains more energy due to which the lateral erosion increases with the depth.

Hence, it is clear that lateral erosion increases with the velocity of the river.

Answer 2

Explanation:

Widening of a river valley takes place due to Lateral Erosion. Such lateral erosion can takes place when the river enters the middle phase after completing the vertical deepening. Even down cutting can be found sue to raises of the steam from the base and the level of the river can reach the base level. In this case, we can find higher level of lateral erosion.