Which of the following pairs is incorrectly matched?

1. Structural Plains : Coromandel Plains
2. Wind Deposition Plains : Thar Desert
3. River Deposition Plains : Northern Plains (India)
4. Marine Deposition Plains : Western Coastal Plains (India)

Epeirogenic forces lead to the formation of Block Mountains. In this context which of the following are true?

1. Horst — block mountains with flattened summits.
2. Graben — basins separating block mountains.
3. Vosges — example of block mountains.
4. All of the above.

Assertion (A): Many lakes exist in the vast lowland of the Great Plains of the USA.

Reason (R): The Great Plains were formed due to uplift of land submerged under water.

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.

What is meant by a landform? Give two examples.