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What Are Facts About Extrusive Igneous Rocks?

April 26, 2017extrusive facts igneous rocks

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What Are Facts About Extrusive Igneous Rocks?

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10 Posted

Facts about Extrusive Igneous Rocks: 1) Igneous rocks that cool slowly deep in the earth are called Intrusive igneous rocks and have large crystals. (Granite) 2) Igneous rocks that cool quickly on the surface of the earth form rocks with small crystals called extrusive rocks. (Basalt, obsidian) 3) Sometimes extrusive igneous rocks look like glass and have no crystals or mineral particles.