Give a reason for each of the following:

1. Igneous rocks are also called Primary rocks
2. Fossils are present in Sedimentary rocks
3. The core of the Earth is in a semi—solid state

(i) Differentiate between intermontane plateau and volcanic plateau.

(ii) Give an example of residual mountain and an example of depositional plain

What is the composition of the earth's crust?

Name any two types of volcanoes giving one example of each type.