Question

How are extrusive and intrusive igneous rocks formed?​

Answer 1

The two main catergories of igneous rocks are extrusive and intrusive igneous rocks..

• Extrusive igneous rocks are formed on the surface on the earth from lava,which is magma that has emerged from the underground..
• Intrusive igneous rocks are formed from magma that cools and solidifies within the crust of the planet..

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Answer 2

Answer:

When the molten lava comes on the earth's surface, it rapidly cools down and becomes solid. Rocks formed in this way on the crust are extrusive igneous rocks.

Sometimes the molten magma cools down deep inside the earth's crust. Solid rocks so formed are the intrusive igneous rocks.

Explanation:

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