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Chapter 5 - Igneous Rocks
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Formation Igneous rocks form from cooling magma.
If they cool inside the Earth, they are called __________ igneous rocks and have _______ crystals. If they cool on the surface, they are called __________ igneous rocks and have _______ crystals. intrusive large extrusive small
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Crystal Size This piece of obsidian cooled so _____ on the surface that it did not have time to form any crystals. fast
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Crystal Size This piece of rhyolite also cooled on the surface very fast and has ______ crystals. small
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Crystal Size This piece of granite cooled _______ inside the Earth and has ______ crystals. slowly large
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Classification is based on crystal size and composition.
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magma igneous rock lava extrusive intrusive
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extrusive; small grain size
gabbro has a large grain size intrusive; its large grain size
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