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Plate Tectonics: The Puzzle of Continental Drift

Learn about Alfred Wegener, the German scientist who first proposed the theory of continental drift and the existence of a super-continent. Explore the lithosphere, asthenosphere, and tectonic plates, and discover how they are responsible for geological activity at plate boundaries.

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Plate Tectonics: The Puzzle of Continental Drift

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  1. Plate Tectonics Carrie Armstrong, Erin Rickert, Lydia Nguyen, Emmy Penquite

  2. German Scientist • First to actively pursue the idea of a super-continent • Also came up with the theory of continental drift Alfred Wegener

  3. How he got started: • The first clue Wegener had was the matching coast lines • he said they were almost like pieces of a jigsaw puzzle • Then noticed that other continents seemed to fit together to

  4. Plate Tectonics

  5. Lithosphere • outer part of the Earth • Includes the crust and the mantle • about 100 km thick lithosphere

  6. Asthenosphere • The ductile part of the earth just below the lithosphere • Includes the lower mantle • Referred to as hot plastic • About 180 km thick asthenosphere

  7. Tectonic Plates • The tectonic plates glide over the asthenosphere at relates ranging from 1-16cm per year • Movement resembles ice drifting across a pond

  8. Continental Drift • The continents and ocean basins make up the upper parts of the plates • As the plates glide the ocean and continents move with it • link

  9. Geological activity • Most of this activity occurs at plate boundaries • Three types of plate boundaries exist • 1. divergent • 2. convergent • 3. transform

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