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Continental drift wegener evidence


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Continental drift wegener evidence

  1. 1. Continental Drift
  2. 2. Continental Drift Hypothesis <ul><li>1915 - Alfred Wegener, German scientist noted how continents could fit together like a puzzle. </li></ul><ul><li>He suggested that all continents once formed a supercontinent he called Pangea and has moved. </li></ul>47090 Play
  3. 3. Alfred never gave up… <ul><li>He continued to gather evidence. </li></ul><ul><li>He died in 1930 in Greenland. </li></ul><ul><li>An explanation was not accepted until the 1960’s. </li></ul>
  4. 4. What is continental drift? Theory that all the continents had once been joined as a single landmass - a supercontinent. 200 million years ago … Pan = All Gaea = Earth
  5. 11. Continental Drift Hypothesis <ul><li>Wegener could not explain what made the supercontinent split and move apart. </li></ul><ul><li>He was laughed at and he died in 1930 . </li></ul>3422-3425
  6. 12. Continental Drift Hypothesis <ul><li>In 1950's the following evidence was observed </li></ul><ul><li>1. Continental shelf outlines match each other very closely. </li></ul><ul><li>2. Rock layers and rock ages in </li></ul><ul><li>Africa match those in South </li></ul><ul><li>America . </li></ul>
  7. 14. Continental Drift Hypothesis <ul><li>3. Similar diamonds in similar </li></ul><ul><li>rock strata matched South </li></ul><ul><li>America and Africa. </li></ul><ul><li>4. Mountain ranges of North </li></ul><ul><li>America and Europe </li></ul><ul><li>matched . </li></ul>3449-50
  8. 16. Continental Drift Hypothesis <ul><li>5. Ancient animal remains of </li></ul><ul><li>Mesosaurus and Lystrosaurus </li></ul><ul><li>matched the continents. </li></ul><ul><li>6. Climate studies of continents </li></ul><ul><li>show the different continents have same climates at one time . </li></ul>
  9. 17. Continental Drift Hypothesis <ul><li>7. Glacial remains found on </li></ul><ul><li>South America, Africa, India, </li></ul><ul><li>Australia and Antarctica </li></ul><ul><li>matched. </li></ul>
  10. 18. Continental Drift Hypothesis <ul><li>8. Magnetic material in the </li></ul><ul><li>rocks matched on South </li></ul><ul><li>America, Africa, India, </li></ul><ul><li>Australia, and Antarctica . </li></ul>
  11. 19. 2 unanswered questions that led to the rejection of Wegener’s Theory of Continental Drift <ul><li>What forces could move continents? </li></ul><ul><li>How could continents move without shattering? </li></ul>