Denudation is the process that wears away landmass and reshapes the surface of the earth. Which of the following process is NOT involved in it?

1. Weathering
2. Erosion
3. Deposition
4. Mass wasting

The disintegration of rocks by atmospheric agents at or near the surface of the earth:

1. Erosion
2. Weathering
3. Mass movement
4. Denudation

The large-scale movement of loose materials (rock-waste) down the slope on account of gravity:

1. Mass movement
2. Deposition
3. Denudation
4. Weathering

Assertion (A): In the upper course the dominant activity of a river is erosion.

Reason (R): The river flows swiftly as the gradient is steep.

1. Both A and R are true and R is the correct explanation of A.
2. Both A and R are true but R does not explain A.
3. A is true but R is false.
4. A is false but R is true.