Question

Differentiate between intrusive and extrusive igneous rock

Answer 1

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What is the difference between Intrusive and Extrusive Rocks?

• Intrusive rocks are formed from magma whereas extrusive rocks are formed from lava.

• Intrusive rocks are formed deep inside the surface of the earth whereas extrusive rocks are formed at the surface of the earth when magma finds a way to eject or pour out of the surface.

• Cooling and solidification of intrusive rocks takes place very slowly whereas contact with air and water causes cooling of extrusive rocks to take place at a very rapid rate.

• Intrusive rocks are made up of enormous crystals whereas extrusive rocks have tiny crystals that can be seen only with a microscope.

• Granite is the best example of intrusive rocks whereas the basalt is a fine example of extrusive rocks.

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Answer 2

Answer:

Extrusive igneous rocks come from lava, forming at the surface of the Earth and cooling quickly, meaning they form very small crystals. Intrusive igneous rocks come from magma, forming deep underground and taking longer to cool, meaning they form larger crystals.