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Cuernos Del Paine, Andes Mountains Gabriel Callaghan

Cuernos Del Paine, Andes Mountains Gabriel Callaghan. Examples of divergent boundaries. So, we’re making new crust? . Convergent plate boundaries. 2 types of crust = 3 possible combinations Oceanic lithosphere meets oceanic lithosphere Oceanic lithosphere meets continental lithosphere

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Cuernos Del Paine, Andes Mountains Gabriel Callaghan

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  1. Cuernos Del Paine, Andes Mountains Gabriel Callaghan

  2. Examples of divergent boundaries

  3. So, we’re making new crust?

  4. Convergent plate boundaries 2 types of crust = 3 possible combinations • Oceanic lithosphere meets oceanic lithosphere • Oceanic lithosphere meets continental lithosphere • Continental lithosphere meets continental lithosphere

  5. Convergent boundaries involving oceanic lithosphere • At convergent boundaries oceanic plates are subducted. • Subduction is the recycling of oceanic crust into the mantle

  6. Play convection animation

  7. Subduction zonesare characterized by two things: • Deep trench • Long chain of volcanoes Volcanic arc Trench

  8. Where is this subduction zone?

  9. At oceanic-oceanic convergent boundaries, volcanoes form chains of islands called island arcs. The Aleutian Islands in Alaska

  10. At continental-oceanic convergent boundaries, volcanoes form long mountain chains such as the Cascade Mountains. Mt. Saint Helens

  11. Subduction zones cause the largest Earthquakes known. • The 2004 Tsunami in the Indian Ocean was caused by an earthquake at a subduction zone.

  12. Continent-continent convergent boundaries • Neither lithospheric plate can be fully subducted. • Instead, the plates pile up to form huge mountain ranges

  13. Where is this continent-continent collision?

  14. You are here

  15. Play plate motions animation

  16. Transform plate boundaries • Relatively few volcanoes • Lots of earthquakes, though not so large as at subduction zones

  17. Where is this transform boundary?

  18. Mid-ocean ridge transforms

  19. Hot Spots

  20. Hot Spots of the World

  21. Divergent boundaries

  22. Begin with rifting—upwelling of hot mantle starts to break the crust apart

  23. Faults form rift valleys • Decompression causes melting and volcanism

  24. New oceanic crust begins to form. The plate boundary is now a mid-ocean ridge.

  25. The Theory of Plate Tectonics Active Rift Aulacogen Mantle Plume

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