Plate Tectonics 10.3 08 09

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Plate Tectonics 10.3 08 09

  1. 1. Ch 10 Plate Tectonics <ul><li>Section 10.3 Theory of Plate Tectonics </li></ul>
  2. 2. Ah – ha! <ul><li>Scientists realized that the continental drift idea could be explained by sea floor spreading……(early 1960’s) </li></ul><ul><li>The Earth’s crust is broken into “plates” that move, grow, and subduct. </li></ul>
  3. 3. Page 280
  4. 4. <ul><li>Plates are made of ______ and upper ________; these compose the _________. </li></ul><ul><li>These ______ plates float and move atop the plasticlike layer called the ________. </li></ul>
  5. 5. <ul><li>Plates are made of crust and upper mantle ; these compose the lithosphere . </li></ul><ul><li>These rigid plates float and move atop the plasticlike layer called the asthenosphere . </li></ul>
  6. 7. The Earth’s Plates
  7. 8. Global Plate Motions
  8. 10. Types of Boundaries <ul><li>Convergent </li></ul><ul><li>Divergent </li></ul><ul><li>Transform </li></ul>
  9. 11. Tectonics – study of formation of crustal features <ul><li>Oceanic crust – thin, dense, basaltic </li></ul><ul><li>Continental crust – thick, less dense, granitic </li></ul>
  10. 12. Convergent Boundary <ul><li>Ocean plate – continental plate </li></ul>
  11. 13. Convergent Boundary <ul><li>ocean plate – ocean plate </li></ul>
  12. 15. Convergent Boundary <ul><li>Continental plate – continental plate </li></ul>
  13. 17. Himalayan Mountains
  14. 18. Divergent Boundary Common at Mid-Ocean Ridges (M-O-R)
  15. 21. East African Rift Valley – Red Sea
  16. 22. Transform Boundary
  17. 24. What makes the plates move?
  18. 25. Plates move like they are groceries on a conveyor belt
  19. 26. What Drives It: Convection
  20. 27. Examples of convection
  21. 28. Examples of convection
  22. 29. Plate Tectonics <ul><li>Features on Earth’s surface are a result of interactions of plates at their boundaries </li></ul><ul><ul><li>Earthquakes </li></ul></ul><ul><ul><li>Faulted and folded mountains </li></ul></ul><ul><ul><li>Volcanic landforms </li></ul></ul><ul><ul><li>Rocks </li></ul></ul>
  23. 31. <ul><li>No </li></ul><ul><li>Plates are destroyed as fast as they are created (2 ways) </li></ul><ul><li>Plates may be subducted and melted or may push be pushed upward to form mountains </li></ul>So is the Earth getting bigger?

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