How are extrusive and intrusive igneous rocks formed class 7?
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Extrusive rocks are formed by the molten lava which comes out of volcanoes, reaches the earth's surface and cools down rapidly to become a solid piece of rock. ... When the molten magma cools down deep inside the earth's crust, the solid rocks so formed are called intrusive rocks.
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when magma cool above the surface extrusive igneous rocks formed
when Magma cools below surface intrusive igneous rocks are formed
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