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There are many varieties of igneous rock. Igneous means it formed as a result of volcanic activity (the word igneous comes from the same root word as ignite) which produces extreme heat. Two main types of igneous rocks are intrusive (cooled gradually underground) and extrusive (cooled more rapidly at or near the surface.) Common examples of igneous rocks include granite, pumice, obsidian, basalt, diorite, andesite.

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12y ago

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