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 forces of faulting, also known as epeirogenic forces, lead to the formation of Block mountains. Due to tensional force, cracks or faults may occur on the earth's crust. If two parallel faults occur, the land in between subsides to form a rift valley. If a block rises, it forms a horst or block mountain.
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