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Do Now:. Take out homework What are the clues that serve as evidence for continental drift?. Module F: Chapter 4. Plate. Tectonics. Don’t copy the words typed in this color. Module F: 4.1 Continental Drift. Describe the hypothesis of continental drift.

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  1. Do Now: Take out homework What are the clues that serve as evidence for continental drift?

  2. Module F: Chapter 4 Plate Tectonics

  3. Don’t copy the words typed in this color

  4. Module F: 4.1 Continental Drift • Describethe hypothesis of continental drift. • Identifyevidence supporting the theory of continental drift. Objectives:

  5. Evidence for Continental Drift 1. Pangaea ____________________ ____________________ ____________________ ____________________ 2. Fossil Clues 3. Climate Clues 4. Rock Clues

  6. 1. Pangaea - ______________ thought that all the __________ were joined together at some time in the past- 1912: Wegener proposed the hypothesis of _______________ Alfred Wegener continents continental drift

  7. - The theory of ________________ states that continents moved ___________ to current locations - ________ believed all __________ were once connected as one large landmass (________) that broke apart about ___________ years ago continental drift horizontally Wegener continents Pangaea 200 million

  8. 2. Fossil Clues Mesosaurus • __________ - reptile found in South America and Africa • ____________ – fern found in Africa, Australia, India, South America and Antarctica Glossopteris THINK!!! What is significant about where the fossils are found? Are the continents, they are found on, near one another at all?

  9. Mesosaurus Findings!!!

  10. Mesosaurus

  11. MESOSAURUS • Mesosaurus ("middle lizard") was an odd, fresh-water dwelling reptile (not a dinosaur) that lived from the late Carboniferous. It was a lightly-built, four-legged animal with an elongated head and snout with nostrils near its eyes. It had a flattened tail that was probably used for swimming. It was about 1.5 feet long. This carnivore probably ate fish and shrimp, catching them with its mouth. It was a primitive reptile that returned to the water about 300 million years ago after having adapted to the land; one of the first aquatic reptiles.

  12. Glossopteris

  13. Glossopteris Findings!!!

  14. 3. Climate Clues fossils - _______ of warm-weathered plants were found on the island of Spitzbergen in the _______________ - glacial deposits and grooves found in _______ America, Africa, India, and ___________ Arctic Ocean South Australia How could you explain why glacial deposits are found in areas where no glaciers exist today? - Wegener believed that South America, Africa, India and Australia were near the _______ Pole at one time; the theory of ___________________ split them up South continental drift

  15. Glacial Findings!!!

  16. similar rock structures found on different continents (example: parts of the ____________ Mountains of the eastern United States are similar to those found in Greenland and western _________) 4. Rock Clues Appalachian Europe

  17. AppalachianMountains

  18. Similar Rock Findings!!!

  19. How could continents drift? - Wegener died before he could provide evidence - Rock, fossil, climate and new clues such as _________________ (learned about in 4.2) help provide a more precise explanation seafloor spreading

  20. Let's Review!!! • State one reason why Wegener’s ideas about continental drift were not accepted. • 2. How did Wegener use climate clues to support his hypothesis about continental drift?

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