Igneous Rock Features <ul><li>Igneous-  “from fire”, one of 3 major types of rock  </li></ul><ul><li>Most magma cools & so...
 
 
Most common are: <ul><li>Batholiths </li></ul><ul><li>Dikes </li></ul><ul><li>Sills </li></ul><ul><li>Volcanic necks </li>...
Batholiths
Batholiths Baja Batholith (southern CA)
Batholiths <ul><li>The largest intrusive rock bodies </li></ul><ul><li>Can be many hundreds of kilometers wide and long, a...
 
 
Yosemite National Park in CA
Yosemite National Park in CA
What is the difference between a dike and a sill?
Dikes Ship Rock, NM Morocco
Sills
Sills
Sills
Volcanic necks Devil’s Tower, WY
 
Volcanic necks <ul><li>Magma inside vent hardens </li></ul><ul><li>Softer rock of cone and surface weathers and erodes awa...
 
Calderas <ul><li>an unusually large crater or the remains when the cone collapses into its own magma chamber </li></ul>
Formation of Crater Lake
 
 
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Volcanoes 12 3 Notes 08 09

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Volcanoes 12 3 Notes 08 09

  1. 1. Igneous Rock Features <ul><li>Igneous- “from fire”, one of 3 major types of rock </li></ul><ul><li>Most magma cools & solidifies underground to form hard, very dense rock </li></ul><ul><ul><li>Result in different sizes and shapes of rock bodies that are visible at the surface when the overlying rock is weathered and eroded away </li></ul></ul><ul><ul><li>Called intrusive when they form below the surface </li></ul></ul><ul><ul><li>Slow cooling causes rock to have large crystals </li></ul></ul>
  2. 4. Most common are: <ul><li>Batholiths </li></ul><ul><li>Dikes </li></ul><ul><li>Sills </li></ul><ul><li>Volcanic necks </li></ul><ul><li>also </li></ul><ul><li>Calderas </li></ul>
  3. 5. Batholiths
  4. 6. Batholiths Baja Batholith (southern CA)
  5. 7. Batholiths <ul><li>The largest intrusive rock bodies </li></ul><ul><li>Can be many hundreds of kilometers wide and long, and several kilometers thick </li></ul>
  6. 10. Yosemite National Park in CA
  7. 11. Yosemite National Park in CA
  8. 12. What is the difference between a dike and a sill?
  9. 13. Dikes Ship Rock, NM Morocco
  10. 14. Sills
  11. 15. Sills
  12. 16. Sills
  13. 17. Volcanic necks Devil’s Tower, WY
  14. 19. Volcanic necks <ul><li>Magma inside vent hardens </li></ul><ul><li>Softer rock of cone and surface weathers and erodes away </li></ul><ul><li>Hard, dense igneous rock is exposed </li></ul>
  15. 21. Calderas <ul><li>an unusually large crater or the remains when the cone collapses into its own magma chamber </li></ul>
  16. 22. Formation of Crater Lake

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