define igneous rock
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Igneous rocks are formed from the solidification of molten rock material. ... Examples of intrusive igneous rocks are diorite, gabbro, granite, pegmatite, and peridotite. Extrusive igneous rocks erupt onto the surface, where they cool quickly to form small crystals.
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igneous rocks are first rocks to be formed they are also known as primary rocks they are formed by cooling lava
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