Volcanic eruptions

  • Created by: apple87
  • Created on: 27-05-14 16:40
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  • Volcanic eruptions
    • Occur when molten rock emerges from the crust.
    • Oceanic and continental crust colliding.
      • Dense oceanic plate is forced underneath the less dense oceanic plate.
        • Oceanic rust is cooler at the edges so it sinks more easily- pulling the plate down.
        • Subduction
      • As oceanic crust is forced down it melts and starts to rise.
        • If the molten rock finds its way to the surface volcanoes form.
    • Form igneous rock
      • Some volcanoes produce iron rich basalt.
        • Runny larva.
      • Type depends on the composition of the magma.
      • Some produce silica rich rhyolite magma.
        • This eruption is explosive and produces thick larva which is violently blown out of the volcano.
    • Trying to predict volcanic eruptions.
      • Geologists study volcanoes is see if there are signs of an eruption.
        • Magma movement below ground
      • Scientists can now easily spot eruption with greater accuracy than in the past.
      • However volcanoes are very unpredictable
        • Scientists will most likely only be able to say an eruption is more likely than normal.
          • Can save lives


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