Sunday, July 19, 2015

Plate tectonics summary

Types  Process
Types of plates Landforms Examples
Divergent
Plate Boundary
     A) 2 oceanic plates move away from each other
     B) Magma rises at fracture to create ridge
     C) Create volcanoes if magma builds above sea level

Oceanic - Oceanic plate Oceanic ridges
Volanic islands
Mid-Atlantic Ridge
Azores in North Atlantic Ocean
     A) 2 continental plates move away from each other
     B) Stretched and cause fractures at boundary
     C) Land in between sinks and forms rift valley and volcanoes
  

Continental - Continental plate  Rift valley
Volcanoes
Great Rift Valley of East Africa
Cascade Range volcanoes
Convergent
Plate Boundary
     A) 2 oceanic plates move towards each other
     B) Denser oceanic plate
subducts under the less dense plate
     C) Forms oceanic trench at subduction zone
     D) Crust of subducted plate
melts and form magma
     E) Magma rises and forms volcanoes or island arc
     F) Earthquakes occur due to friction from subduction
  

Oceanic - Oceanic plate Oceanic trenches
Volcanoes
Island Arc
Mariana Trench
Mount Etna
Mariana Islands
     A) 2 continental plates collide towards each other
     B) Crust compresses and
folds
     C) Massive folding forms a range of fold mountains
  

Continental - Continental plate  Mountain Range Himalayas
     A) 2 oceanic plates move towards each other
     B) Denser oceanic plate
subducts under the less dense 
          continental plate
     C) Forms oceanic trench at subduction zone
     D) Crust of subducted plate
melts and form magma
     E) Continental plate folds into fold mountains
     F) Magma rises through crust and forms volcanoes
   

Oceanic - Continental plate Oceanic trenches
Mountain ranges
Sunda Trench
Barisan Mountains
Transform
Plate
Boundary
     A) 2 plates slide past each other
     B) Creates stress and tension
     C) Tension released as earthquakes
  

 Continental - Continental
Continental - Oceanic plate
Oceanic - Oceanic plate
None North Anatolian Fault
San Andreas Fault

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