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Volcano Explosions and Types. What causes different types of explosions?. Trapped gases: Water vapor and carbon dioxide can be trapped in the magma Results in an explosive eruption Composition Silica poor Silica rich. Silica Poor. Low in silica- basaltic magma

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what causes different types of explosions
What causes different types of explosions?
  • Trapped gases:
    • Water vapor and carbon dioxide can be trapped in the magma
    • Results in an explosive eruption
  • Composition
    • Silica poor
    • Silica rich
silica poor
Silica Poor
  • Low in silica- basaltic magma
    • Results in a quiet, non-explosive eruption
    • Kilauea
      • http://www.youtube.com/watch?v=tcRz_EIZsRk
silica rich
Silica Rich
  • High in silica- granitic
    • Magma being forced upward by denser surrounding rock comes in contact with the crust which is rich in silica
    • Soufriere Hills
      • http://www.youtube.com/watch?v=8sPyyHY57H4
neither rich or poor in silica
Neither Rich or Poor in Silica
  • Between basaltic and granitic- Andesitic
    • Often forms at convergent plate boundaries when one plate slides under the other
    • Violent eruption
    • Krakatau
      • http://www.youtube.com/watch?v=JmPuy-pqIQE&feature=related
forms of volcanoes
Forms of Volcanoes
  • Three main types:
    • Shield
    • Cinder cone
    • Composite
shield volcanoes
Shield Volcanoes
  • Typically has sloping sides
    • Caused by basaltic lava spreading out in flat layers
  • Hawaii
cinder cone
Cinder Cone
  • Steep, loosely packed sides
    • Usually from materials of explosive volcanoes falling back to earth and settling on the mountain sides
  • Paricutin
c omposite
Composite
  • Tepha- composed of rock and/or solidified lava
  • Composite volcano is the result of layering
    • Tephra-lava-tephra-etc.
    • Often occurs where plates come together and one slides beneath the other
  • Soufriere Hills