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Plate Tectonics

Plate Tectonics. www.historyforkids.org. visibleearth.nasa.gov. The Theory of Continental Drift. A hypothesis that the continents slowly move across Earth’s surface Proposed by Alfred Wagner. Pangea Interactive Map.

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Plate Tectonics

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  1. Plate Tectonics www.historyforkids.org visibleearth.nasa.gov

  2. The Theory of Continental Drift • A hypothesis that the continents slowly move across Earth’s surface • Proposed by Alfred Wagner

  3. Pangea Interactive Map The name of the single landmass that broke apart 200 million years ago and gave rise to today’s continents www.enchantedlearning.com/

  4. Evidence! Evidence Interactive Map

  5. “Jigsaw Puzzle” The continents of Africa and South America match up like jigsaw-puzzle pieces!! Observing: Which coastlines seem to match up like jig-saw puzzle? http://science.pppst.com/platetectonics.html

  6. What might the presence of marsupials in Australia and North America suggest? Fossils Same plant and animal fossils found on the coastlines of different continents. Marsupials migrated and then evolved differently when continents separated. http://science.pppst.com/platetectonics.html

  7. Rocks and Climates • Tropical plant remains (coal deposits) found in Antarctica • Same rock patterns found in South America, India, Africa, Antarctica and Australia

  8. Convergent Boundaries Where plates collide, forming mountains.

  9. Divergent Boundaries • Where plates move apart, forming volcanoes and ocean rifts.

  10. Transform Fault Boundaries • Where plates slide past each other, causing earthquakes.

  11. Subduction • This occurs when 2 plates converge, but one plate is more dense than the other and is shoved under another

  12. What is a common novelty item that uses convection? Convection! • Hot magma in the Earth moves toward the surface, cools, then sinks again. • Creates convection currents beneath the plates that cause the plates to move. Lava Lamps! http://science.pppst.com/platetectonics.html

  13. Think about it…. 90% of world’s earthquakes 75% of world’s volcanoes http://science.pppst.com/platetectonics.html

  14. Turn and Talk • In groups of 3, take a few minutes to discuss the following…. • Use your knowledge of plate tectonics to explain the recent events in Haiti. • Make predictions about other events we could expect to see in the future in this area.

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