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VOLCANOES, PROCESSES, HAZARDS + IMPACTS 1.3.2 - Coggle Diagram

- - - - high density mix of gas, volcanic fragments and ash
      - moves at high speed
      - happens when eruption column collapses
      - greatest volcanic hazard
      - MEXICO 1982 - killed 2,300 people
      - 1000°C, 80km/h
    - - speed depends on type, steepness, and viscosity
      - least hazardous - people have time to get away
      - impacts human life - destroys homes and land
    - - covers large areas
      - most frequent hazard - 5% of deaths
      - impacts humans
      - weight collapses buildings
      - clogs engines
      - destroys farmland
      - respiratory problems
    - - magma rises, pressure decreases, gases released
      - co2
      - sulfur dioxide
      - low death toll
  - - - mixture of volcanic ash, debris and water
      - travels down volcanic slope
      - velocity = 200km/h
      - increases in size as it moves down the slope
      - greatest risk after pyroclastic flow
      - destroys buildings
    - - glacial outbursts of floods
      - subglacial volcanic activity causes melting of glaciers
      - trapped water released after eruption
      - tend to occur in sparsely populated areas - reduces impact
      - causes flooding
    - - mass of volcanic rock moves rapidly under force of gravity
      - can bury areas
      - cause floods - block streams
      - create lahars
      - can trigger eruptions