what is three course of river
Answers
Explanation:
In the mountainous course, a river passes through a steep slope. Its water, therefore, rushes down with great speed. Under such a condition the water can dig the river bed very deeply and carries or pools down heavy boulders and pebbles. Erosion and transportation are the main activities of a river in the upper course.
The Middle Course:
As a river leaves the hilly area and enters into a plain, its middle course starts. The slope of the river bed is less on a plain. Hence, the speed of the current is also less, compared to the upper course. The river is fed by many tributaries and its volume of water increases.
. The Lower Course:
The last part of a river near its mouth is called the lower course. In this part the slope of the river bed is not very steep. The current is also very slow. Deposition is the main activity of a river at this stage. The silt and other materials carried by the river are deposited. The river channel is blocked very often and new branch channels are dug out.