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Chapter 5 - Igneous Rocks

Chapter 5 - Igneous Rocks. 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.

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Chapter 5 - Igneous Rocks

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  1. Chapter 5 - Igneous Rocks

  2. 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

  3. Crystal Size • This piece of obsidian cooled so _____ on the surface that it did not have time to form any crystals. fast

  4. Crystal Size • This piece of rhyolite also cooled on the surface very fast and has ______ crystals. small

  5. Crystal Size • This piece of granite cooled _______ inside the Earth and has ______ crystals. slowly large

  6. Classification is based on crystal size and composition.

  7. magma igneous rock lava extrusive intrusive

  8. small extrusive; small grain size gabbro has a large grain size intrusive; its large grain size

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