CONTINENTAL DRIFT <ul><li>Ms. Kopchick’s Earth Science Class </li></ul>
The earth is a dynamic Planet. <ul><li>Its surface is constantly changing along with the interior earth. As convection cur...
Continental Drift  <ul><li>Hypothesis that continents are mobile. </li></ul><ul><li>First argued by Alfred Wegener in 1915...
Evidence of Continental Drift <ul><li>Puzzle piece fit of the continents  </li></ul><ul><li>The present shorelines seem to...
<ul><li>Puzzle piece fit </li></ul>
 
Glacial Evidence <ul><li>Glacial till was left behind in Africa and India </li></ul><ul><li>Currently these areas are to w...
<ul><li>These areas were once closer to the South Pole </li></ul>
Paleoclimatic Evidence <ul><li>As Africa and India were near the southern part of Pangea, North America, Europe and North ...
Fossil Evidence <ul><li>Mesosaurus – Estuarine reptile </li></ul><ul><li>Only from S. America & S. Africa </li></ul><ul><l...
 
Structural Continuity <ul><li>Correlation of rocks and fossils on both sides of the Atlantic Ocean. </li></ul>
 
Fish fossils on top of Mt. Everest ?? <ul><li>Fossils of marine life found at mountaintops in the Himalayas can only be ex...
Hot Spots or Mantle Plumes <ul><li>Stationary areas in the mantle that eject magma to form volcanoes and the continental p...
<ul><li>Oceanic Crust moving the volcanoes away from the hotspot </li></ul>
 
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Continental Drift

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Continental Drift

  1. 1. CONTINENTAL DRIFT <ul><li>Ms. Kopchick’s Earth Science Class </li></ul>
  2. 2. The earth is a dynamic Planet. <ul><li>Its surface is constantly changing along with the interior earth. As convection currents move in the mantle, earthquakes occur, volcanoes erupt, mountains are uplifted and sea basins are opened. </li></ul>
  3. 3. Continental Drift <ul><li>Hypothesis that continents are mobile. </li></ul><ul><li>First argued by Alfred Wegener in 1915. </li></ul><ul><li>Wegener published a 1915 book “ The </li></ul><ul><li>Origins of Oceans and Continents” </li></ul>
  4. 4. Evidence of Continental Drift <ul><li>Puzzle piece fit of the continents </li></ul><ul><li>The present shorelines seem to fit together as a puzzle </li></ul><ul><li>A much closer fit is using the edge of the continental shelf </li></ul>
  5. 5. <ul><li>Puzzle piece fit </li></ul>
  6. 7. Glacial Evidence <ul><li>Glacial till was left behind in Africa and India </li></ul><ul><li>Currently these areas are to warm to have glaciers </li></ul><ul><li>Evidence of a cooler earth? No, plenty of tropical plants at the same time. </li></ul><ul><li>Explanation: Africa and India were once closer to the Poles </li></ul>
  7. 8. <ul><li>These areas were once closer to the South Pole </li></ul>
  8. 9. Paleoclimatic Evidence <ul><li>As Africa and India were near the southern part of Pangea, North America, Europe and North Africa were near the Equator. </li></ul><ul><li>Topical reefs and corals along with coal deposits can be found in Alaska today. </li></ul><ul><li>Since these things can only survive in warm climates, the explanation is that Alaska was once closer to the Equator. </li></ul>
  9. 10. Fossil Evidence <ul><li>Mesosaurus – Estuarine reptile </li></ul><ul><li>Only from S. America & S. Africa </li></ul><ul><li>Glossopteris - Heavy seeds, subpolar climate </li></ul><ul><li>Found in India, Australia, S. America & Africa </li></ul><ul><li>Heavy seeds in a subpolar climate </li></ul><ul><li>These creatures could NOT have traversed an ocean. </li></ul>
  10. 12. Structural Continuity <ul><li>Correlation of rocks and fossils on both sides of the Atlantic Ocean. </li></ul>
  11. 14. Fish fossils on top of Mt. Everest ?? <ul><li>Fossils of marine life found at mountaintops in the Himalayas can only be explained by crustal uplift. </li></ul>
  12. 15. Hot Spots or Mantle Plumes <ul><li>Stationary areas in the mantle that eject magma to form volcanoes and the continental plate or oceanic plate moves the volcanoes with them like a conveyor belt. </li></ul>
  13. 16. <ul><li>Oceanic Crust moving the volcanoes away from the hotspot </li></ul>

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