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III)Drifting Continents

Explore Alfred Wegener's theory of continental drift, which proposes that all the continents were once joined together and have since drifted apart. Discover the evidence from landforms, fossils, and climate that supports this hypothesis, as well as why Wegener's theory was initially rejected by scientists.

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III)Drifting Continents

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  1. III)Drifting Continents

  2. Focus on the Big Idea EQ: What was Alfred Wegener’s hypothesis and what evidence did he provide to support his hypothesis?

  3. A) The Theory of Continental Drift Video

  4. Alfred Wegener “He’s the Man” Phrases & Words: I know I don’t know

  5. * Alfred Wegener Wagener's hypothesis was that all the continents had once been joined together in a single landmass and have since drifted apart.

  6. B)Pangaea (all lands) Pangaea's Moving Farther Apart Again Song Phrases & Words: I know I don’t know Video Pangaea (from the Greek for "all the Earth")

  7. B)Pangaea (all lands) • Pangaea- the name Wagener gave to the super continent, meaning “all lands” • Wagener believed that Pangaea had broken apart and that the pieces had slowly moved to become the continents they are today Pangaea (from the Greek for "all the Earth")

  8. C) Continental Drift • The idea that the continents slowly moved over Earth’s surface

  9. D) Support for Continental Drift

  10. D) Support for Continental Drift

  11. 1) Evidence from Landforms

  12. 1) Evidence from Landforms

  13. 2) Evidence from Fossils • Fossil- any trace of an ancient organism preserved in rock

  14. 3) Evidence from Climate

  15. Alfred Wegener “Crust in Pieces” Phrases & Words: I know I don’t know

  16. E) Scientist Reject Wegener's Theory Video

  17. 1) Many OTHERgeologists believed that the mountains formed by the cooling and shrinking of Earth. 2) Wegenerthought mountains formed when drifting continents collided, causing their edges to crumple and fold.

  18. Scientist Reject Wegener's Theory 3) Wegener could not provide a satisfactory explanation for the force that pushes or pulls the continents. Wegener died in 1930 on an expedition to Greenland’s continental glacier. He died before scientist excepted his theory on “Continental Drift” Video

  19. “Alfred Wegener Speaks out!”

  20. Continental Drift

  21. Brain Pop

  22. Review

  23. What was Wegener’s theory of continental drift? The idea that the continents slowly moved over Earth’s surface

  24. 2. What were the three types of evidence Wegener used to support his theory of continental drift? Evidence form landforms Evidence form fossils Evidence form climate

  25. 3. How did Wegener use evidence based on fossils to support his theory that the continents has moved? Fossils leaves of Glossopteris are found in rocks in Africa, South America, Australia, India, and Antarctica.

  26. 4. What is Pangaea? Supercontinent- where all the continents were once joined together

  27. 5. What was the main reason scientists rejected Wegener’s theory of continental drift? Wegener could not provide a satisfactory explanation for the force that pushes or pulls the continents

  28. 6. How did Wegener think that mountains formed? He thought they formed when drifting continents collided, causing their edges to crumple and fold

  29. 7. How do the locations of mountains support Wegener’s idea about how mountains form? Mountains usually occur in narrow bands along the edges of continents, as you would expect if the collision of continents forms mountains

  30. 8. What is a fossil? any trace of an ancient organism preserved in rock

  31. 9. Why was Wegener’s hypothesis rejected? He could not provide a satisfactory explanation of the force to “move” continents.

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