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Continental Drift


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Continental Drift

  1. 1. Continental Drift By Alexandra Contreras
  2. 2. Information <ul><li>The Continental Drift, is a theory that proposed that all of the continents were once a single land mass. This theory was proposed by Alfred Wegner, a German Scientist, in the year of 1912. This continent (one single land mass), is known as Pangaea. Basically, this theory stated that the continents continually moved. </li></ul>
  3. 3. Dispute over theory <ul><li>Although, this is the theory believed by many scientists today, many were skeptical about Wegner's theory during his period of time. Many were skeptical, because he couldn't prove the theory of the Continental Drift, although he proposed the idea. Furthermore, he couldn't prove the movement of the continents . However, after Wegner passed away, it was proven that the movement of the continents, resulted from the motion of crustal plates. </li></ul>
  4. 4. Evidence <ul><li>Although, Wegner didn't have any proof, there was evidence discovered supporting the theory by several scientists. Unfortunately, the evidence was gathered after Wegner passed away. There are approximately five pieces of evidence that support the theory of the Continetnal Drift. </li></ul>
  5. 5. Pangaea Evidence <ul><li>The first piece of evidence, which proves the theory of the Continental Drift, is all of the continents fitting together like puzzle pieces in a jig saw puzzle. Furthermore, if you connect all of the continets, they fit perfectly together, proving that they were all once connected. This proved the existence of Pangaea. </li></ul>
  6. 6. Pangaea This is a map, of what Pangaea supposodly looked like. This map proves, the theory of the continental Drift, becase it shows all of the continents connected, fitting together like a &quot;jig saw puzzle&quot;. This is a map, of the world today, including all of the countries. This map, displays all of the countries after the Continental Drift. What resulted from Pangaea breaking apart into segments, creating the many coutries which the world contains today.
  7. 7. Pangaea Evidence <ul><li>The second piece of evidence which proves the theory of the Continental Drift, is the similar ancient animals and plant fossils, found on the edges of various continents. For example, Mesosaur, Glossopteris, Cygnonathus, and Lystrosaurus, were founded on the edges of multiple continents. </li></ul>fossil of a Glossopteris Fossil of a Mesosaur fossil of a Cynognathus Fossil of a Lystrosaurus
  8. 8. This is a map of Pangaea, showing the continents connected and showing the matching fossils of plants and animals.
  9. 9. Pangaea Evidence <ul><li>The third piece of evidence, which supports the theory of the Continental Drift, is the continents having the same ancient continental rocks. Basically meaning, various countries have identical rock sequences. For Example, South America and Africa have identical rock sequences, because they were joined when pangaea existed. </li></ul>
  10. 10. Pangaea Evidence <ul><li>The fourth piece of evidence, which proves the theory of the Continental Drift, is North America and Europe having the same mountain ranges. Furthermore, there have been mountain ranges found in North America and Europe that are identical, proving the theory. </li></ul>
  11. 11. Pangaea Evidence <ul><li>the last piece of evidence which supports the existence of Pangaea, is the climatic conditions. Furthermore, there ve been glacial deposits founded in the tropics and coal founded in Antarctica. This supports the theory of the Continental Drift, because coal originates from tropical plants, which can only be founded in the tropics. Additionally glacial deposits can only come from Antarctica, proving the theory. </li></ul>This photo shows the glacial deposts founded in various continents