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

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

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

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