Igneous Rocks

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Igneous Rocks

  1. 1. By Ms. Simmons Igneous Rocks <ul><li>How are igneous rocks formed </li></ul><ul><li>Difference between lava and magma </li></ul><ul><li>Different kinds of igneous rocks </li></ul><ul><li>Uses of igneous rocks </li></ul>
  2. 2. <ul><li>Rock: is a material made up of one or more minerals </li></ul><ul><ul><li>3 groups based on how rocks are formed: </li></ul></ul>ROCKS <ul><ul><ul><ul><li>Igneous </li></ul></ul></ul></ul><ul><ul><ul><ul><li>Sedimentary </li></ul></ul></ul></ul><ul><ul><ul><ul><li>Metamorphic </li></ul></ul></ul></ul>
  3. 3. <ul><li>Form when melted rock hardens </li></ul><ul><ul><li>Fine-grained: cools and hardens fast with small mineral crystals </li></ul></ul><ul><ul><li>Coarse-grained: cools and hardens slowly with large mineral crystals </li></ul></ul>Igneous Rocks
  4. 4. <ul><li>Magma: </li></ul><ul><ul><li>Melted rock that stays below the earth’s surface </li></ul></ul><ul><ul><li>Naturally forms within the earth </li></ul></ul><ul><li>Lava: </li></ul><ul><ul><li>Melted rock that reaches the earth’s surface through a volcano </li></ul></ul>Magma and Lava
  5. 5. <ul><li>Formed below earth’s surface </li></ul><ul><li>Magma’s minerals cool and harden slowly </li></ul><ul><li>Forms coarse crystals </li></ul>Intrusive Rocks Gabbro Granite Diorite
  6. 6. <ul><li>Formed at earth’s surface </li></ul><ul><li>Lava’s minerals cool and harden quickly </li></ul><ul><li>Forms tiny crystals </li></ul>Extrusive Rocks Obsidian Rhyolite Basalt Andesite
  7. 7. <ul><li>Volcano erupts into air or water </li></ul><ul><li>Cools very fast </li></ul><ul><li>No crystals </li></ul>Volcanic Glass Obsidian Pumice
  8. 8. <ul><li>Concrete, roads, and buildings </li></ul><ul><li>To make tools </li></ul><ul><li>As an abrasive material in soaps and nail files </li></ul>Uses

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