Question

Define -
1. External process
2. Erosion
3. Deposition
4. Weathering
5. Gradation
6. Agradation

Answer 1

Answer:

1) External processes shape the relief created by internal processes. External agents carry out this process: water, ice, wind, atmosphere and human beings. They include all the changes that alter or wear down the rocks and deposit materials resulting from erosion.

2) Erosion is the process by which the surface of the Earth gets worn down. Erosion can be caused by natural elements such as wind and glacial ice. But anyone who has ever seen a picture of the Grand Canyon knows that nothing beats the slow steady movement of water when it comes to changing the Earth.

3) the natural process of leaving a layer of a substance on rocks or soil; a substance left in this way

4) Weathering causes the disintegration of rock near the surface of the earth. ... Weathering breaks down and loosens the surface minerals of rock so they can be transported away by agents of erosion such as water, wind and ice. There are two types of weathering: mechanical and chemical.

5) Gradation is the process of levelling the land by means of moving agents like rivers, winds, sea and waves. The highlands are made low by erosion or wearing away and the lowlands are raised by adding the eroded materail by the process of deposition.

6) Aggradation is the term used in geology for the increase in land elevation, typically in a river system, due to the deposition of sediment. Aggradation occurs in areas in which the supply of sediment is greater than the amount of material that the system is able to transport.