Metamorphic rocks

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Metamorphic rocks

  1. 1. Metamorphic Rocks FORMED BY HEAT AND PRESSURE
  2. 2. OLDER ROCKS MAY BE FORMED INTO A NEW TYPE OF METAMORPHIC ROCK
  3. 3. - Metamorphic rocks can form from igneous, sedimentary or other metamorphic rocks.
  4. 4. EARTHQUAKES AND VOLCANIC ACTIVITY CAUSE HEAT AND PRESSURE TO ACT ON ROCKS.
  5. 5. - sometimes temperature and pressure are great enough to melt rock, forming magma.
  6. 6. - sometimes pressure flattens mineral grains in rocks without melting them.
  7. 7. - as pressure and temperature continue to increase over time, one type of rock can change into several different metamorphic rocks.
  8. 8. METAMORPHIC ROCKS ARE CLASSIFIED BY CLASSIFICATION AND TEXTURE
  9. 9. CLASSIFICATION: 1. Foliated texture: mineral grains flatten and line up in parallel layers or bands.
  10. 10. 2. Nonfoliated texture: mineral grains grow and rearrange but do not form layers.
  11. 11. Foliated Rocks <ul><li>Original Rock: shale (sedimentary) </li></ul><ul><li>Metamorphic Rock: slate </li></ul>
  12. 12. Foliated Rock <ul><li>Original Rock: granite (igneous) </li></ul><ul><li>Metamorphic Rock: gneiss </li></ul>
  13. 13. Nonfoliated Rock <ul><li>Original Rock: limestone (sedimentary) </li></ul><ul><li>Metamorphic Rock: marble </li></ul>
  14. 14. Nonfoliated Rock <ul><li>Original Rock: sandstone (sedimentary) </li></ul><ul><li>Metamorphic Rock: quartzite (melted sand) </li></ul>
  15. 15. USES OF METAMORPHIC ROCK: 1. blackboards, roofs, sidewalks, floors: slate
  16. 16. 2. building stone: gneiss, marble, quartzite
  17. 17. 3. statues, tombstones: marble AND GRANITE

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