Geography

 In today's lesson, we learn about:

                                                    River

- the three main works of the river comprises of erosion, transportation, and deposition.

I) Erosion

- It is the removal of materials from the Earth's surface. The erosional work of a river depends on channel gradient, volume of water, river load, and velocity. 

- erosion is the geographical process in which earthen materials are worn away and transported by natural forces such as wind or water. 

II)Transportation.

    

   - River transport the eroded materials from higher gradient to lower gradient. The transportation capacity is determined by size and amount of load, volume and velocity of a river.

   - Transportation, the movement of goods and persons from place to place and various means by            which such movement is accomplished. The growth of the ability-and the need- to transport large quantities of goods or numbers of people over long distances at high speeds in comfort and safety has been an index of civilization and in particular of technological progress.

III) Deposition 

       - Deposition of loads take place as the river enters the low-lying areas. It is due to decrease in gradient and velocity of river.