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.
- Dense oceanic plate is forced underneath the less dense oceanic plate.
- 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.
- Some volcanoes produce iron rich basalt.
- 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
- Scientists will most likely only be able to say an eruption is more likely than normal.
- Geologists study volcanoes is see if there are signs of an eruption.
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