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6th Grade-Ch. 5 Sec. 2 Igneous Rocks
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6th Grade-Ch. 5 Sec. 2 Igneous Rocks

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  • 1. Ch. 5 Sec. 2 Igneous Rocks
  • 2. igneous rock – formed from magma or lava
  • 3. classified by 1. origin 2. texture 3. mineral composition where formed? on or beneath Earth’s surface depends on size & shape of mineral crystals Silica content
  • 4. 1. origin
    • ex trusive rock = formed from lava on Earth’s surface
      • ex. basalt
    • in trusive rock = formed from magma below Earth’s surface
      • ex. granite
  • 5. 2. texture
    • depends on size & shape of mineral crystals
  • 6. different textures
    • no crystals form
    • extremely rapid cooling
    4. glassy
    • large crystals surrounded by smaller crystals
    • forms when magma cools slowly- then rapidly
    3. porphyritic
    • large crystals
    • slow cooling
    2. coarse-grained
    • small crystals
    • rapid cooling
    1. fine-grained
  • 7. coarse-grained fine-grained
  • 8. porphyritic
  • 9. 3. mineral composition
    • lava low in silica  dark colored rocks
    • lava high in silica  light colored rocks
  • 10. uses of igneous rocks
    • hard, dense, & durable
    • ex :
  • 11.
    • granite
    • building material
    statues floors
  • 12.
    • pumice
    • good abrasive for cleaning & polishing
  • 13. basalt
    • makes gravel in construction
  • 14. Were you paying attention?
  • 15. What does igneous rock form from?
    • magma or lava
  • 16. How are igneous rocks classified ?
    • according to:
    • origin
    • texture
    • mineral composition
  • 17. Why have people throughout history used igneous rocks for tools and building materials?
    • They are hard, dense, & durable.
  • 18. What igneous rock is used to make gravel in construction? basalt
  • 19. What type of igneous rock formed from lava on Earth’s surface ?
    • extrusive rock
  • 20. What type of igneous rock formed from magma below Earth’s surface ?
    • intrusive rock