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Metamorphic rock

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  • 1. Metamorphic rock
  • 2. Vocabulary
    • _________- change in rock due to heat and pressure
    • __________- has a banded appearance
    • __________- does not have a banded appearance
    Metamorphism foliated non-foliated
  • 3. Let us review
    • We already learned
      • There are three types of rocks
        • Igneous rocks-
          • Igneous – “rock from fire”
            • Made by molten rock (magam and lava) that has cooled down
        • Sedimentary rocks
          • Sedimentary rocks – settled rocks
            • Pieces of rocka nd other particles get put together to form rock
        • Metamorphic rock
          • We shall see………………………..
  • 4. From what materials are metamorphic rocks made?
    • The easy answer is from ALL rocks
      • Whether it is
        • Sedimentary
        • Igneous
        • Metamorphic
      • It is a recrystallization of unmelted
      • ALL of them can form into metamorphic rocks under the right conditions
  • 5. What are the right conditions to form metamorphic rocks?
    • Heat and pressure
      • Therefore metamorphic rocks primarily can only be formed deep in the Earth’s crust
      • OR
      • Contact metamorphism – this is when it forms because it is near a magma flow
        • It gets the heat it needs from the magma
  • 6.
    • Metamorphic rocks can change
      • Shape
      • Texture of the original rock
      • Mineral composition
    • Sometimes scientists can sometimes tell What the original rock was and other times they can’t
      • The orginal rock is called Parent Rock
  • 7. When do we see metamorphic rock? When the earth’s surface erodes or weathered the metamorphic rock is exposed
  • 8. How can I tell the difference between metamorphic rocks?
    • Metamorphic rocks are usually harder and more dense
    • Original layers commonly get bent or distorted
    • It may also show foliation
      • The alignment of minerals or separation of different minerals into flaky layers or light and dark bands
  • 9. Foliation vs. Non foliation
    • A fantastic way to classify metamorphic rock
      • Foliation is very big indicator of metamorphic rocks
      • Non- foliation are classified by composition (what they are made up of)
  • 10. Banding
    • Different minerals give metamorphic rocks a striped appearance
      • separated of light and dark minerals into layers
        • The more pressure and higher temperature and pressure the thicker the band
  • 11. Distorted structure
    • Is folding or bending of rock layers
      • This occurs do to strong Earth forces
      • Causing the rock to have deformed appearance
  • 12. Regional Metamorphism
    • Makes the most of the metamorphic rock
      • This is caused by the pressure that occur with mountain building
  • 13. Let’s review