RIFT VALLEYS AND OCEAN RIDGES

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  • Created by: Lara_S
  • Created on: 09-05-15 19:48

OCEAN TRENCHES

  • form at destructive plate margins (oceanic convergence and oceanic and continental convergence)
  • if the convergence is slow then the ocean trench is clearly defined.
  • often volcanic activity in the form of island arcs parallel to ocean ridges

Mid Atlantic Ridge

  • moves 3-10cm a year
  • less than a quarter of the lava reaches teh surface due to intrusive activity
  • from South

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