Videos A to Z

• Plate Tectonics: Mid-ocean ridge map

  
  • 3-5
  • 6-8
  • 9-12

  Mid-ocean ridges form the largest mountain range in the world - over 80,000 km long.  » more info

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• Plate Tectonics: Mid-ocean ridges video clip

  
  • 3-5
  • 6-8
  • 9-12

  Mid-ocean ridges are underwater mountain ranges.  » more info

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• Plate Tectonics: Ocean floor moving

  
  • 3-5
  • 6-8
  • 9-12

  Continents ride on top of drifting pieces of the ocean floor. As the ocean floor moves, the continents move.  » more info

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• Plate Tectonics: Pacific plate

  
  • 3-5
  • 6-8
  • 9-12

  The Pacific Plate is the largest of the seven major plates.  » more info

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• Plate Tectonics: Plate boundary

  
  • 3-5
  • 6-8
  • 9-12

  A plate boundary is where plates meet. This depicts a subduction zone, in which one plate is pushed under another. Subduction zones are also referred to as destructive zones because oceanic lithosphere…  » more info

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• Plate Tectonics: Plate interactions

  
  • 3-5
  • 6-8
  • 9-12

  Plates can interact in three ways: move toward one another in a convergent boundary; move away from each other at divergent plate boundaries, or slide past each other at a transform fault.  » more info

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• Plate Tectonics: Rift valley

  
  • 3-5
  • 6-8
  • 9-12

  A rift valley is a crack along a mid-ocean ridge where a lot of volcanic activity occurs.  » more info

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• Plate Tectonics: Seafloor spreading

  
  • 3-5
  • 6-8
  • 9-12

  The theory of seafloor spreading states that the seafloor is moving, causing segments to separate at mid-ocean ridges, where lava wells up from valley rifts, forming a new ocean floor.  » more info

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• Plate Tectonics: Subduction

  
  • 3-5
  • 6-8
  • 9-12

  Subduction is the process of one plate plunging beneath another plate. Volcanoes often result.  » more info

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• Plate Tectonics: Transform fault

  
  • 3-5
  • 6-8
  • 9-12

  Rocks slide past each other at transform faults, which are characterized by shallow earthquakes, but have little volcanic activity. The San Andreas fault is an example of a transform fault.  » more info

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