Question

How are extrusive and intrusive rocks formed?

Answer 1

intrusive rocks:- when magma cools down and solidifies deep inside the earth, they are called intrusive igneous rocks. they cools slowly due to high temperature so they have grained surface.
extrusive rocks:- when magma cools down and solidifies outside the earth's surface, they are called extrusive igneous rocks. they cools fastly , so they have smooth surface.
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Answer 2

Answer:

Intrusive land forms are formed when the lava in volcanoes doesn't reach the surface of the earth and may cool under the surface and become rocks.

Extrusive land forms are formed when the part of lava which pours on the surface of the earth forms extrusive land forms

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