Plate Tectonics 10.1 08 09

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Plate Tectonics 10.1 08 09

  1. 1. Ch 10 Plate Tectonics <ul><li>Section 10.1 </li></ul>
  2. 2. Continental Drift <ul><li>continental drift - a hypothesis proposed in 1912 by German meteorologist, </li></ul><ul><li> Alfred Wegener </li></ul>
  3. 3. Continental Drift <ul><li>one landmass called Pangaea </li></ul><ul><li>one ocean called Panthalassa </li></ul>
  4. 4. Continental Drift <ul><li>Based on: </li></ul><ul><li>rock clues </li></ul><ul><li>fossil clues </li></ul><ul><li>climate clues </li></ul>
  5. 5. Pangaea
  6. 6. Pangaea
  7. 7. Pangaea
  8. 8. Rock clues
  9. 9. Rock clues
  10. 10. Fossil clues
  11. 11. Fossil clues Glossopteris
  12. 12. Climate clues
  13. 15. Continental Drift Theory <ul><li>Evidence: </li></ul><ul><ul><li>Puzzle-like fit of continents </li></ul></ul><ul><ul><li>Identical fossils & rock structure on various continents </li></ul></ul><ul><ul><li>Glacial deposits in present-day tropical climates </li></ul></ul><ul><ul><li>Coal deposits in present-day temperate climates </li></ul></ul>
  14. 16. Wegener’s idea was rejected in early 1900’s – <ul><li>because he could not answer: </li></ul><ul><li>“ What caused the continents to move?” </li></ul><ul><li>“ How, when, or why did continents move?” </li></ul>
  15. 17. Sea Floor Spreading <ul><li>1947 – rocks on ocean floor found to be younger than continental rocks </li></ul><ul><li>1960 – Princeton U. – Harry Hess – proposed theory of Seafloor Spreading – if seafloor is moving, continents may also be moving </li></ul><ul><li>mid-1960’s – paleomagnetic reversal time scale developed for continental rock matches that of rocks found on sea floor </li></ul>
  16. 19. The Geomagnetic Reversal Time Scale
  17. 20. Discovery of Sea-Floor Spreading
  18. 21. Sea-Floor Spreading

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