2.4 tectonic plate boundaries

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2.4 tectonic plate boundaries

  1. 1. Tectonic Plate Boundaries Ag Earth Science Mr. Silva
  2. 2. Objective• Students will be able to identify three different plate boundaries, explain what type of stress is acting on them, and tell what landscape features are created at each boundary.
  3. 3. Three Plate Boundaries• Divergent Plate Boundaries • aka. Spreading Centers• Convergent Plate Boundaries • aka. Subduction Zones• Transform Boundaries • aka. Transform Faults
  4. 4. Divergent Plate Boundaries
  5. 5. Divergent Plate Boundaries• Pull Apart• Tension• Create new rock (Lithosphere) • Occur under water (Oceanic Crust) • Occur on land (Continental Crust)
  6. 6. Mid Atlantic Ridge
  7. 7. Continental Rifting
  8. 8. African Rift Valley Example of Continental Rifting
  9. 9. Convergent Plate Boundaries
  10. 10. Convergent Plate Boundaries• Push together “plates collide”• Compression• Destroy/Recycle rock (lithosphere)
  11. 11. Convergent Plate Boundaries• Three Possible Collisions • Oceanic-Continental Collision • Oceanic-Oceanic Collision • Continental-Continental Collision
  12. 12. Oceanic-Continental Collision continental• Denser oceanic crust dives under crust• Oceanic crust is then recycled by melting back into the mantle• This massive collision creates deep ocean trenches, an accretionary wedge, a forearc basin, and a volcanic arc.• Exactly like the California landscape.
  13. 13. California’s Profile
  14. 14. Oceanic-Oceanic Collision• One oceanic plate will subduct under another• Creates deep ocean trenches• Creates volcanic island arcs• Example: the Aleutian Islands in Alaska or Japan
  15. 15. Aleutian Islands are aaAleutian Islands are Volcanic Island Arc Volcanic Island Arc
  16. 16. Continental-Continental Collision• This occurs when continental crust is riding on a subducting plate and then smashes into another continent
  17. 17. Transform Fault Boundaries
  18. 18. In the simplest form, plates slide past each other
  19. 19. In Review

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