Igneous rocks

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How igneous rocks are made, 2 groups, examples

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Igneous rocks

  1. 1. Igneous Rocks
  2. 2. <ul><li>Rock - material made up of one or more minerals </li></ul><ul><li>3 groups of rocks classified by HOW they are formed </li></ul><ul><li>Igneous rock- form from melted rock when hardened </li></ul>
  3. 3. <ul><li>Extrusive igneous rocks </li></ul><ul><li>Formed from lava “exiting” the volcano and cooling quickly </li></ul><ul><li>Forms fine-grain crystals </li></ul>Andesite Basalt Obsidian Pumice Rhyolite
  4. 4. <ul><li>Intrusive igneous rocks </li></ul><ul><li>Formed when magma “inside” the volcano cools s-l-o-w-l-y </li></ul><ul><li>Forms large grain crystals </li></ul>Peridotite Gabbro Granite Pegmatitie Diorite
  5. 5. Formation <ul><li>Igneous rocks form from cooling magma. </li></ul><ul><li>If they cool inside the Earth, they are called __________ igneous rocks and have _______ crystals. </li></ul><ul><li>If they cool on the surface, they are called __________ igneous rocks and have _______ crystals. </li></ul>intrusive large extrusive small
  6. 6. Crystal Size <ul><li>This piece of obsidian cooled so _____ on the surface that it did not have time to form any crystals. </li></ul>fast
  7. 7. Crystal Size <ul><li>This piece of rhyolite also cooled on the surface very fast and has ______ crystals. </li></ul>small
  8. 8. Crystal Size <ul><li>This piece of granite cooled _______ inside the Earth and has ______ crystals. </li></ul>slowly large
  9. 9. Classification is based on crystal size and composition.
  10. 10. magma igneous rock lava intrusive extrusive
  11. 11. small extrusive; small grain size gabbro has a large grain size intrusive; its large grain size

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