Metamorphic rocks

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