Plate Margins

Geography plate tectonice and margins mindmap

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  • Plate Margins
    • Collision
      • Convection currents opposite directions into each other
        • Causes fold mountains  however take a while
          • However due to constant movement frequent earthquakes formed (can be very severe)
      • Only when to continental plates collide
        • As plates are the same density they crumble in upward direction
          • EXAMPLE- Himalayas, Eurasian crashed with the Indian Plate.
    • Destructive
      • Convection currents in opposite directions towards each other
        • Oceanic and continental plate
      • As oceanic is more dense it sinks
        • This motion creates a subduction zone, a deep sea trench.
          • Also triggering severe earthquakes
          • Oceanic plate melts as gets deeper forming magma chamber
      • EXAMPLE- Andes Mountains, Nazca plate went underneath South American plate
      • Volcanoes also formed, as oceanic plate sub ducts takes water and other volaties with it which lowers the melting point.
        • Newly formed magma is light and and rises to he top of the mantle breaking through crust forming volcanoes
          • Silica picked up on the way makes magma more viscous
    • Conservative
      • When plates are forced to slide past one another
        • Although crust isn't formed or destroyed at this point earthquakes can occur if the plates stick
          • When this happens pressure builds up, one plate jerks and shockwave sent to surface.
      • EXAMPLE - San Andreas fault (California) American plate moves slowly past Pacific plate
  • Constructive
    • Plate Margins
      • Collision
        • Convection currents opposite directions into each other
          • Causes fold mountains  however take a while
            • However due to constant movement frequent earthquakes formed (can be very severe)
        • Only when to continental plates collide
          • As plates are the same density they crumble in upward direction
            • EXAMPLE- Himalayas, Eurasian crashed with the Indian Plate.
      • Destructive
        • Convection currents in opposite directions towards each other
          • Oceanic and continental plate
        • As oceanic is more dense it sinks
          • This motion creates a subduction zone, a deep sea trench.
            • Also triggering severe earthquakes
            • Oceanic plate melts as gets deeper forming magma chamber
        • EXAMPLE- Andes Mountains, Nazca plate went underneath South American plate
        • Volcanoes also formed, as oceanic plate sub ducts takes water and other volaties with it which lowers the melting point.
          • Newly formed magma is light and and rises to he top of the mantle breaking through crust forming volcanoes
            • Silica picked up on the way makes magma more viscous
      • Conservative
        • When plates are forced to slide past one another
          • Although crust isn't formed or destroyed at this point earthquakes can occur if the plates stick
            • When this happens pressure builds up, one plate jerks and shockwave sent to surface.
        • EXAMPLE - San Andreas fault (California) American plate moves slowly past Pacific plate
    • Caused by convection current in the mantle
    • Convection Current travel different directions causing plates to move away from each other
      • Earthquakes made but very shallow and not big
    • EXAMPLE- mid atlantic ridge, Eurasion  plate moved away from North American
    • Magma rises through gap and cools
      • This causes a new oceanic crust to form which then makes volcanoes
        • Tend to be less severe as no silica mixed in to the magma

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