Igneous Rocks
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Igneous Rocks

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Igneous Rocks Igneous Rocks Presentation Transcript

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