Which amongst the following are highly eroded by the agents of gradation and have gentler slopes, rounded tops and sculptured domes?

1. Young fold mountains
2. Old fold mountains
3. Residual mountains
4. Volcanic plateaus

Mountains which are subjected to weathering and erosion for a long time are lowered down:

1. Old fold mountains
2. Volcanic plateaus
3. Relict mountains
4. Intermontane plateaus

Assertion (A): The forces of faulting lead to the formation of block mountains.

Reason (R): Block mountains are often separated by intervening basins called graben.

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 Coromandel plains along the east coast of India were formed as a result of two different activities. Name them.

1. Subsidence, deposition
2. Subsidence, erosion
3. Upliftment, deposition
4. Upliftment, erosion