Assertion (A): Residual mountains are also called mountains of denudation.

Reason (R): Denudation and erosion by natural agents cause mountains to be lowered.

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.

Which amongst the following highlands 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

Which of the following is/are correctly matched?

1. Young fold mountains: Himalayas, Alps
2. Old fold mountains : Urals, Aravalli
3. Residual mountains : Nilgiri, Rajmahal Hills
4. All of the above.

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.