Intrusive igneous rocks are formed by magma that has cooled slowly, deep underground. Granite is an intrusive igneous rock. Granite has large crystals which can be easily seen with the naked eye.
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What are thundereggs? The rare, chalcedony-filled rocksThis process can occur either below the Earth’s surface, forming intrusive or plutonic igneous rocks like granite, or at the surface following a volcanic eruption, producing extrusive or ...
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