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Metamorphic Rocks

Metamorphic Rocks. Rock Formation. Sedimentary Rocks and Igneous rocks form from: Other Rocks. Metamorphic Rocks form as existing rocks change. Popcorn. How do you make popcorn? Add heat to a kernal . It pops and becomes a fluffy snack. Metamorphism.

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Metamorphic Rocks

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  1. Metamorphic Rocks

  2. Rock Formation • Sedimentary Rocks and Igneous rocks form from: • Other Rocks • Metamorphic Rocks form as existing rocks change.

  3. Popcorn • How do you make popcorn? • Add heat to a kernal. • It pops and becomes a fluffy snack.

  4. Metamorphism • The process of changing an existing rock by heat or pressure, or both.

  5. Parent Rocks • The original sedimentary or igneous rock is called a parent rock.

  6. Undergoing Change • Pressure can cause a rock’s minerals to flatten out in one direction. • The rock does NOT melt during this process. • If the rock did melt, what kind of rock would we now have?

  7. Recrystallization • Crystals form from minerals. • Heat and/or pressure break the bonds of those atoms. • The bonds then can reform in a new way.

  8. Pg 97 – How rocks change

  9. Changes occur over large and small areas. • Changes that occur depend on: • Type of Parent Rock • Temperature • Pressure

  10. Changes occur over large and small areas. • For metamorphic change to occur over large areas there must be: • High Pressure • High Temperature • When only one of these is present, changes tend to occur over smaller areas. Large Areas Small Areas

  11. Metamorphism Over Large Areas • Large blocks of rocks are pushing together. • Rocks are: • Buried • Pushed together • Heated • Bent • Deeper the rock, the greater the metamorphism

  12. Metamorphism Over Small Areas Using Heat • Magma can push up through cracks in the rocks. • Lava can cover rocks on the earth’s surface. • Mainly due to high temperature, not pressure.

  13. Metamorphism Over Small Areas Using Pressure • Rocks move and grind past each other during tectonic plate movement. • This creates a great amount of pressure.

  14. Foliation • Found in metamorphic rocks • Arrangement of minerals in flat or wavy parallel bands.

  15. Foliated Rocks • Commonly found in rocks produced by metamorphic change over large areas. • Found in rocks that are composed of more than one mineral

  16. Non-Foliated Rocks • Made of mainly one type of mineral. • Different minerals cannot separate and line up. • Has not been subjected to high pressure.

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