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Formation of Igneous Rocks: Intrusive vs. Extrusive

Learn how igneous rocks form from cooling magma, understanding the difference between intrusive and extrusive rocks based on crystal sizes and cooling locations. Discover rock classifications based on crystal sizes and compositions.

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Formation of Igneous Rocks: Intrusive vs. Extrusive

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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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