Question

How are extrusive and intrusive rocks formed?

NCERT Class 7th Social Science (Our Environment) Chapter 2 Inside our Earth

Answer 1

Extrusive rocks : some part of the lava which reaches the surface of the earth and cools down to form the extrusive rocks. Intrusive rocks:: some part of lava which doesn't reach the surface of the earth and cools down to form rocks.so the rocks which are formed by the cooling down of the magma are these rocks. Hope this helps u