Plate tectonics axb
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  • 1. The interior structure of the earth
  • 2. The interior structure of the earth
  • 3. The crust and part of the upper mantle = lithosphere
    about 100 km thick
    Less dense than the material below it so it “floats”
    The interior structure of the earth
    The Lithosphere
  • 4. The plastic layer below the lithosphere = asthenosphere
    The plates of the lithosphere float on the asthenosphere
    The interior structure of the earth
    The Asthenosphere
  • 5. The interior structure of the earth
    The Crust
    Two types of crust:
    Continental
    Oceanic
  • 6. Differences between oceanic crust and continental crust?
    Continental crust is composed of granite while the oceanic crust is composed of basalt.
    The density of the continental crust is less than the oceanic crust, thus it floats higher on the mantle.
  • 7. How this tears the surface apart
  • 8. In 1912 a German scientist named Alfred Wegener proposed the theory that the crustal plates are moving over the mantle. This was supported by fossil and rock type evidence; also matching of coastline shapes.
  • 9.
  • 10.
  • 11. Pangaea
  • 12. The Spreading Continents
  • 13.
  • 14. Plate Boundaries Map
    Major plates only
  • 15. Plate Boundaries Map
  • 16. Types of Plate Boundaries
  • 17. Types of Plate Boundaries
  • 18. Rift Valleys - ccd
  • 19. Oceanic Convergence
  • 20. Oceanic to Continental Convergence
  • 21. Continental Collision
  • 22. Transform Faults
  • 23. The future?