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2015-11-21T23:01:27+05:30

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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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