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Plate Tectonics

Plate Tectonics. Liz LaRosa for use with my 5 th Grade Science Class http://www.middleschoolscience.com 2009. Plate Tectonics. Greek – “tektonikos” of a builder Pieces of the lithosphere that move around Each plate has a name Fit together like jigsaw puzzles

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Plate Tectonics

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  1. Plate Tectonics Liz LaRosa for use with my 5th Grade Science Class http://www.middleschoolscience.com 2009

  2. Plate Tectonics • Greek – “tektonikos” of a builder • Pieces of the lithosphere that move around • Each plate has a name • Fit together like jigsaw puzzles • Float on top of mantle similar to ice cubes in a bowl of water

  3. Tectonic Plates

  4. Pangea? Famous Scientist: Alfred Wegener- German Meteorologist He proposed that the Continents were once a single land mass that drifted apart over time. He called this single land mass supercontinent Pangea, Greek for “all Earth” Wegner proposed this in 1912, but it wasn’t considered to be sufficient evidence in itself. He analyzed either side of the Atlantic Ocean for rock type, geological structures, and fossils.

  5. Evidence of Pangea 1. Puzzle-like fit of the continents.

  6. Evidence of Pangea 2. Fossils of the same plants and animals are found on different continents.

  7. Evidence of Pangea 3. Climate Clues.

  8. Evidence of Pangea 4. Rock clues.

  9. Problems with Wegner’s Theory Wegner couldn’t explain how, when, or why Continental Drift took place.

  10. Sea Floor Spreading

  11. Sea Floor Spreading • Mid Ocean Ridges – underwater mountain chains that run through the Earth’s Basins • Magma rises to the surface and solidifies and new crust forms • Older Crust is pushed farther away from the ridge

  12. How Plates Move http://pubs.usgs.gov/gip/dynamic/unanswered.html

  13. Different Types of Boundaries http://pubs.usgs.gov/gip/dynamic/understanding.html

  14. Divergent Boundary – Arabian and African Plates Arabian Plate Red Sea African Plate

  15. Divergent Boundary – Iceland http://pubs.usgs.gov/gip/dynamic/understanding.html

  16. Divergent Boundary - Oceanic http://www.geology.com

  17. Divergent Boundary - Continental http://www.geology.com

  18. Convergent Boundary – Indian and Eurasian Plates Eurasian Plate Indian Plate

  19. Convergent Boundary – Oceanic & Continental http://pubs.usgs.gov/gip/dynamic/understanding.html & http://www.geology.com

  20. Convergent Boundary – Oceanic & Oceanic Note – plates are reversed http://pubs.usgs.gov/gip/dynamic/understanding.html & http://www.geology.com

  21. Convergent Boundaries - Continental http://pubs.usgs.gov/gip/dynamic/understanding.html & http://www.geology.com

  22. Transform Boundary – San Andreas Fault www.geology.com

  23. Review • Name the 3 main layers of the Earth • What is a tectonic plate? • What was Pangea? • What is Sea-Floor spreading? • Name the three different types of plate boundaries and one location on Earth for each one

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