Volcanoes

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Basaltic lava
Constructive boundaries. Originates from upward movement of mantle. Low visicocity and so runny. Not violent, but may erupt often over an extended period of time.
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Rhyolitic lava
Destructive boundaries. Higher viscocity and so may block volcanic vent causing pressure. Leads to short violent eruptions
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Composite volcano
Rhyolitic lava/destructive margin. Characterised by huge ash clouds which create layers of ash and lava in the rock. Steep sides due to lava. Mount Etna is an example.
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Caldera
Rhyolitic lava/destructive margin. An enourmous explosion causes a crater where the vent used to be. This may be flooded by sea water or create a lake. Krakatoa, Indonesia is an example.
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Shield volcano
Basaltic lava/constructive &hotspots. Gentle sides due to less viscous lava. Mauna Loa, Hawaii is an example
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Fissure volcano
Basaltic lava/constructive margins. Long linear crack. It is fairly flat and so the low viscous lava travels long distances create a lava plateux. Giants Causeway, Ireland is an example
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Other cards in this set

Card 2

Front

Destructive boundaries. Higher viscocity and so may block volcanic vent causing pressure. Leads to short violent eruptions

Back

Rhyolitic lava

Card 3

Front

Rhyolitic lava/destructive margin. Characterised by huge ash clouds which create layers of ash and lava in the rock. Steep sides due to lava. Mount Etna is an example.

Back

Preview of the back of card 3

Card 4

Front

Rhyolitic lava/destructive margin. An enourmous explosion causes a crater where the vent used to be. This may be flooded by sea water or create a lake. Krakatoa, Indonesia is an example.

Back

Preview of the back of card 4

Card 5

Front

Basaltic lava/constructive &hotspots. Gentle sides due to less viscous lava. Mauna Loa, Hawaii is an example

Back

Preview of the back of card 5
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