how are extrusive and intrusive rocks formed
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Extrusive rocks are formed on the surface of the Earth from lava, which is magma that has emerged from underground. Intrusive rocks are formed from magma that cools and solidifies within the crust of the planet.
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Answer: Igneous rocks are classified into two groups - intrusive and extrusive. Intrusive igneous rocks are formed when magma cools slowly below the surface ,while extrusive igneous rocks are formed when lava cools rapidly at the surface.
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