Volcanos

AQA 1.4 Geography A textbook GCSE

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Different types of volcanoes

Shield Volcanos

  • Shield Volcanos are usually found found at constructive  boundaries
  • They are low with slopping sides
  • They are formed by eruptions of runny thin lava

The characteristics of a shield volcano (http://www.bbc.co.uk/schools/gcsebitesize/geography/images/tec_015.gif)

 

 

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Different types of volcanoes

Composite

  • Made up of layers of lava and ash
  • usually found at destructive plate boundaries
  • Pyroclastic blow rather than lava whihc means it contains steam, ash rock and dust.
  • Very high speed erruptions and very high temperaures (400C) Characteristics of a composite volcano (http://www.bbc.co.uk/schools/gcsebitesize/geography/images/tec_016.gif)
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How do Volcanoes affect the people?

 

 

 

  • Primary effect - the immediate effects of the eruption, caused directly by it e.g houses burning down
  • Secondary effect - the after effects that occur as an indirect effect of the erruption - long term e.g people starving because crops are destroyed
  • Immediate Responses - How people react as the disaster happens and the immediate aftermath e.g helicopters, tents food, water
  • Long term responses - later reactions, weeks or months after the event e.g warning systems
  • Natural Hazard - an occurance that people have little control over

 

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Monitoring and Predicting Volcanoes

We cannot predict an exact date or time for an erruption or an earthquake to occur, however we can predict there is going to be an an erruption even if we dont know when.

  • Tiltmeters - detedcts movement in the ground
  • temperature changes - infrared pictures to detect changes in the ground
  • Sulfur rates - more likely to be an erruption when there is a high sulfur rate
  • Seismographs - Measure ground movements and tremors by ink and needle
  • Hydrology -measures the amount of water in rocks
  • Spiders - enter places that are too dangerous for humans and take measurements.
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