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Theory of Plate Tectonics

Theory Plate Boundaries Convergent Divergent Transform Hot Spots. Theory of Plate Tectonics. What is a SCIENTIFIC THEORY?. A well tested concept that explains a wide range of observations. In 1965, J. Tuzo Wilson, a Canadian scientist proposed the theory of Plate Tectonics

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Theory of Plate Tectonics

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  1. Theory Plate Boundaries Convergent Divergent Transform Hot Spots Theory of Plate Tectonics

  2. What is a SCIENTIFIC THEORY? A well tested concept that explains a wide range of observations • In 1965, J. Tuzo Wilson, a Canadian scientist proposed the theory of Plate Tectonics • Combined knowledge of sea-floor spreading with continental drift

  3. Theory of Plate Tectonics Late 1900’s • Earth’s lithosphere is broken into sections called plates. • Plates are always shifting and moving. • Movement is driven by convection currents in the mantle. Evidence: All the evidence collected over the 1900’s was used in this theory.

  4. Crustal Plates

  5. Lithosphere Asthenosphere Earth’ Layers Earth Layers

  6. Convection Currents of Magma

  7. Plate Boundary Motion • CONVERGE - Moving toward one another. • connecting • DIVERGE – Moving apart. • dividing • TRANSFORM – Sliding past one another. Plate Tectonics IIPlates, Plate Boundaries, and Driving Forceshttp://www.visionlearning.com/library/module_viewer2.php?mid=66&l=&let1=Ear

  8. Plate Boundaries http://www.wwnorton.com/college/geo/egeo/flash/2_6.swf

  9. Convergent Boundary Oceanic Crust – Continental Crust • Features • Subduction Zone • Trench • Volcanic Mountain Arc Tectonic plates connecting Narrative and animation by: Monte Hieb and Nancy Hiebmhieb@geocraft.com

  10. Converging Oceanic Continental Plates

  11. Mt. St. Helens,Washington

  12. Convergent Boundary Continental Crust – Continental Crust Tectonic plates connecting • Features • Folded Mountains http://www.pbs.org/wgbh/aso/tryit/tectonics/convergent.html

  13. Converging Continental Pates

  14. Himalayas

  15. Convergent Boundary Oceanic Crust – Oceanic Crust • Features • Subduction Zone • Trench • Island Arc Tectonic plates connecting http://www.pbs.org/wgbh/aso/tryit/tectonics/convergent.html

  16. Converging Oceanic Plates Subduction Zone

  17. Japan – island arc

  18. Divergent Boundary Tectonic plate dividing • Features • Mid-Ocean Ridge • Rift Zone Narrative and animation by: Monte Hieb and Nancy Hiebmhieb@geocraft.com http://www.pbs.org/wgbh/aso/tryit/tectonics/divergent.html

  19. Diverging Boundary

  20. Transform Boundary http://www.pbs.org/wgbh/aso/tryit/tectonics/transform.html http://www.wwnorton.com/college/geo/animations/transform_faulting.htm Plates move in opposite directions on either side of the transform boundary, causing earthquakes. Plates move in similar directions on either side of the fracture zone (red dashed line), resulting in fewer earthquakes.

  21. Transform Fault San Andreas Fault

  22. Magma has broken through crust as the plate moves over a spot Hot Spots http://www.wwnorton.com/college/geo/animations/hot_spot_volcanoes.htm http://www.classzone.com/books/earth_science/terc/content/investigations/es0810/es0810page03.cfm?chapter_no=investigation

  23. Additional Animations • http://www.seed.slb.com/flash/science/features/earth/livingplanet/plate_boundaries/en/index.html?width=570&height=475&popup=true

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