Saturday, August 10, 2013

Plate Tectonics: Part 8: Trenches and Mountains (315)

In other parts of Earth, plates are not moving apart but coming together. When two plates collide, crust can either be forced back down into the mantle or up to Earth's surface. 

 

A divergent boundary is a place where two plates are moving apart; a convergent boundary is a place where two plates are converging or coming together. A deep- sea trench or underwater depression is formed by this convergence.



When two continental plates collide, they can also force rock upward, creating spectacular mountain ranges.




Key Notes: 
  • When 2 plates collide, crust is either forced back down into mantle or up to the surface
  • divergent boundary: place where 2 plates move apart
  • Convergent boundary: place where 2 plates come together
  • Depp-sea trench: (AKA deep water depression) formed by convergence
  • Mountains formed by divergent boundaries




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