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  • 1. Rocks
  • 2. There are three categories of rocks
    • Igneous rocks
    • Sedimentary rocks
    • Metamorphic rocks
  • 3. Igneous Rock
  • 4. Vocabulary
    • _________- molten rock beneath the earth’s surface
    • ________- small holes made from solified gas bubbles
    • __________- the molten rock that reaches the earth’s surface
    • ___________- rough
    • ____________- lava flows out and hardens
    • ______________- when magma harderns inside the earth
  • 5. Igneous Rocks Definition
    • Igneous rocks are formed from the solidification (making hard) and crystallization of molten rock.
      • This makes the rocks hard, solid and compact.
  • 6. Two Types of Molten Rocks
    • Magma – is the molten rock beneath the Earth’s surface
    • Lava is the molten rock that reaches the Earth’s surface
  • 7.
    • When magma or lava cools and solidifies it forms igneous rocks
      • As the liquid rocks gets harder crystals may form
        • This gives the igneous rocks it’s texture
  • 8. Two types of Igneous Textures
    • The texture of igneous rock is dependent (relies) the rate (speed) of cooling.
      • Slow cooling bigger crystals
        • Coarser (rougher) texture
      • Rapid cooling smaller crystals
        • Finer texture
  • 9. Vesicular
    • When bubbles of gas are in solidified lava there are gas holes called Vesicles
      • Igneous rocks that have these holes are said to be vesicular.
  • 10. Cooling , Temperature, & Pressure
    • Cooling is related to both temperature and pressure
      • When the temperature drops rapidly or pressure is lessened you are going to have less crystals and a finer texture.
      • This is usually with molten rocks closer to the earth’s surface or lava on top of the surface.
  • 11. What are extrusive and intrusive Igneous rocks?
  • 12. Extrusive Igneous rocks
    • Extrusive – when the lava exits the earth’s
    • surface and hardens.
    • - since it is cooler and less pressure exists on the surface the rocks are finer and have less crystals.
    Exit –leave outside
  • 13. Intrusive Igneous Rocks
    • Intrusive when the magma hardens inside the earth.
      • since there is more pressure and heat the deeper you go into the Earth
        • the larger the crystals and the courser (rougher) the texture of the rock is
  • 14. Let’s recap! How do Igneous rocks form Through the solidification and crystallization of magma and lava!
  • 15. How does magma form? Minerals must be melted Some like mica melt under very low temp and other needs a higher temp to melt
  • 16. Igneous rock scheme ( ESRT)
    • This chart is used to help us identify What type of Igneous rock it is.
      • It shows us
        • Color
        • Texture
        • Density
        • Mineral composition
  • 17. Where are igneous rocks found? All over They are in oceans, continental rocks
  • 18. Felsic High density Graphitic Basalt Low density rocks Mafic Continental Ocean