igneous rock, rock formed from cooled molten material, magma, molten rock beneath Earth's surface, lava, molten rock on Earth's surface, intrusive igneous rock, forms when magma cools underground, extrusive igneous rock, forms when lava cools at surface, slow cooling, allows large crystals to grow, fast cooling, produces small or no crystals, large crystals, form when cooling happens slowly, small crystals, form when cooling happens quickly, granite, coarse-grained intrusive igneous rock, basalt, fine-grained extrusive igneous rock, obsidian, volcanic glass with no crystals, pumice, light volcanic rock full of holes

8sci Igneous Rocks

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