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.

Give two chief characteristics of the fold mountains.

Give one example of each:

(a) Young fold mountain.
(b) Old fold mountain.