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Revision - Coggle Diagram

- - - - oceanic hotspots
      - divergent plate boundaries
      - lava flow
      - 1100 degrees c
      - low viscosity (runny)
      - 50% silica content
    - - convergent and destructive plate boundaries
      - lava flow
      - ash and tephra
      - pyroclastic flow
      - lahar
      - 1000 degrees c
      - moderate gas content
      - moderate viscosity
      - 60% silica content
    - - continental hotspots
      - convergent plate boundaries
      - catastrophic explosion
      - 800 degrees c
      - high gas content
      - high viscosity
      - 70% silica content
  - - - also known as 'megafloods' they are very sudden releases of large volumes of water, ice and debris from a glacial source
    - - a hot mixture of rock fragments gas and ash that travels rapidly away from a volcanic vent
    - - molton rock under the ground
    - - when a volcano erupts it can eject materials such as rock fragments in the atmosphere
    - - 99% of the gas molecules emitted during a volcanic eruption
    - - mudflow or debris flow that originates on the slopes of a volcano
  - - - high pressure
      - steep sides
      - silica rich lava
      - high viscosity
    - - low viscosity
      - shallow, sloping volcano
      - effusive