Plate boundaries powerpoint

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Plate boundaries powerpoint

  1. 1. Plate Boundaries
  2. 2. MAJOR TECTONIC PLATES
  3. 5. The Mechanism of Plate Tectonics <ul><li>as the material in the asthenospehre is heated, </li></ul><ul><li>it rises </li></ul><ul><li>as it cools, it is moved horizontally and sinks – </li></ul><ul><li>pulling along the continental and ocean crust </li></ul><ul><li>movement of material in the asthenosphere is </li></ul><ul><li>called convection cells </li></ul>
  4. 6. <ul><li>There are three types of boundaries where </li></ul><ul><li>crustal plates meet: </li></ul><ul><li>divergent </li></ul><ul><li>convergent </li></ul><ul><li>transform </li></ul>
  5. 7. Divergent Plate Boundaries <ul><li>also called rift zone </li></ul><ul><li>plates moving apart </li></ul><ul><li>upwelling part of convection cell </li></ul><ul><li>sea floor is created </li></ul><ul><li>forms mid-ocean ridges </li></ul>
  6. 8. Divergent Plate Boundaries <ul><li>found at most mid-ocean ridges </li></ul><ul><li>ex: Mid-Atlantic Ridge </li></ul>
  7. 9. Divergent Plate Boundaries
  8. 10. Convergent Plate Boundaries <ul><li>also called subduction zones </li></ul><ul><li>plates move toward one another </li></ul><ul><li>downwelling part of convection cell </li></ul><ul><li>sea floor destroyed </li></ul><ul><li>forms trenches and volcanic island arcs </li></ul>
  9. 11. Convergent Plate Boundaries
  10. 12. Transform Plate Boundaries <ul><li>plates move past each other </li></ul><ul><li>faults are formed </li></ul>
  11. 13. Transform Plate Boundaries Example: San Andreas Fault
  12. 15. Ring of Fire <ul><li>around Pacific Ocean </li></ul><ul><li>greatest quantity of earthquakes and volcanoes </li></ul><ul><li>because edges of Pacific Ocean are boundaries </li></ul><ul><li>of Pacific plate </li></ul>
  13. 16. Ring of Fire <ul><li>earthquakes around the world </li></ul>

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