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Plate Tectonics

Explore the Continental Drift Hypothesis and the Theory of Plate Tectonics, including evidence such as fossils, glacial till deposits, and paleomagnetism. Learn about mantle convection currents and the different types of plate boundaries. Discover the risks and potential damages of the Cascadia Subduction Zone and ways to be prepared for earthquakes and tsunamis.

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Plate Tectonics

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  1. Plate Tectonics

  2. Continental Drift Hypothesis • Developed in 1912 by German scientist Alfred Wegener • Continents fit together like puzzle pieces • Similar fossils found on different continents • Further evidence provided by glacial till deposits and paleomagnetism

  3. Pangea Puzzle India

  4. Pangea Puzzle

  5. Pangea Puzzle

  6. Continental Drift Hypothesis • He was unable to explain what caused the continents to drift apart.

  7. Theory of Plate Tectonics • Arthur Holmes, a British geologist, first suggested mantle convection in 1929. • It wasn’t until the 1960’s that the theory of plate tectonics became widely accepted.

  8. Mantle Convection Currents https://www.youtube.com/watch?v=jkKlGXG4lG8 https://www.youtube.com/watch?v=Z9Hr7V1S0pI

  9. Transform Boundary

  10. Divergent Boundary

  11. Convergent Boundary

  12. Convergent Boundary http://www.iris.edu/hq/inclass/animation/ plate_boundary_convergent_margin

  13. Putting it all together http://education.nationalgeographic .com/media/plate-tectonics/ http://www.sciencechannel.com/ tv-shows/greatest-discoveries/videos/ 100-greatest-discoveries-plate-tectonics/

  14. Play with Plate Tectonics!

  15. Cascadia Subduction Zone

  16. Evidence of Subduction Zone Earthquakes & Tsunamis http://pnsn.org/outreach/earthquake sources/csz/landlevelchange

  17. Cascadia Subduction Zone • The last major earthquake off our coast was in 1700. • The next one could happen at any time.

  18. Risk Map

  19. Cascadia Subduction Zone • Magnitude 9 earthquake • Destroy thousands of buildings • Wreck roads and bridges • Disrupt sewer and power lines • Cause up to $32 billion worth of damage • Endanger many people

  20. Be Prepared! • Build infrastructure to withstand earthquakes and provide shelter for people. • Educate people on what to do in the event of an earthquake or tsunami. • Earthquake: DROP, COVER, and HOLD ON! • Tsunami: EVACUATE. GET TO HIGH GROUND!

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