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.

The streams or small rivers which join the main river are called:

1. Transporteries
2. Tributaries
3. Distributaries
4. Meanders

When a river divides into channels or smaller rivers they are called its:

1. Tributaries
2. Distributaries
3. Meanders
4. Transporteries