what do we use igneous rocks,sedimentary rocks and metamorphic rocks?
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Extrusive, or volcanic, igneous rocks are formed when molten hot material cools and solidifies. There are three main types of rocks: sedimentary, igneous, and metamorphic. Each of these rocks are formed by physical changes—such as melting, cooling, eroding, compacting, or deforming—that are part of the rock cycle.
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minerals make up rocks.... Igneous rock, formed by the cooling off magma inside earth the earth or on the surface.
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sorry I don't know about the other rocks
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