Geography
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.
- Both A and R are true and R is the correct explanation of A.
- Both A and R are true but R does not explain A.
- A is true but R is false.
- A is false but R is true.
Answer
Both A and R are true but R does not explain A.
Explanation — The Assertion (A) is true because block mountains are formed by faulting (epeirogenic movements), where a block of land is uplifted between faults. The Reason (R) is also true, as block mountains are often separated by grabens (rift valleys). However, the presence of grabens does not explain the formation of block mountains.
Related Questions
Mountains which are subjected to weathering and erosion for a long time are lowered down:
- Old fold mountains
- Volcanic plateaus
- Relict mountains
- Intermontane plateaus
Which of the following is/are correctly matched?
- Young fold mountains: Himalayas, Alps
- Old fold mountains : Urals, Aravalli
- Residual mountains : Nilgiri, Rajmahal Hills
- All of the above.
The Coromandel plains along the east coast of India were formed as a result of two different activities. Name them.
- Subsidence, deposition
- Subsidence, erosion
- Upliftment, deposition
- Upliftment, erosion
The plains that are formed by the deposition of materials which have been brought by various agents of transportation:
- Structural plain
- Depositional plain
- Polder
- Dykes