3. This is a mass of igneous rock formed from magma which becomes solid just below the crust.
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The two main categories of igneous rocks are extrusive and intrusive. 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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Igneous rocks are formed by solidification of magma.
This magma which comes from the interior of the earth can form igneous rock below the crust or above the earth surface.
When the magma solidifies just below the crust is called Intrusive Igneous rock. Eg: Granite
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