how many types did igneous rock are??????define them
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Igneous rocks are divided into two groups, intrusive or extrusive, depending upon where the molten rock solidifies
\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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