Volcanic Eruptions or Volcanoes are Cool

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Volcanic Eruptions (or Volcanoes are Cool)

• Types of Eruptions.
• Types of Volcanoes.
• Volcanoes and Plate Tectonics.

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Eruptions are Classified as

• Quietor

• Violent!

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Quiet Eruptions
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Violent Eruptions
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What causes quiet or violent eruptions?

• The amount of silica in the magma.
• The amount of water in the magma.
• Other gases in the magma.

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Basaltic Magma

• Magma composed of basalt.
• Contains small quantities of water and other
  gases.
• Contains small quantities of silica.
• Minerals contain quantities of iron.
• Typically quiet eruptions.

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Granitic Magma

• Magma is composed of granite.
• Contains large quantities of silica.
• Contains water and other gases.
• This magma is highly viscous.
• Eruptions are typically violent.

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Two Types of Volcanoes

• Shield Volcano-quiet and runny lava flows
  gently sloping dome-shaped mountain.
• Composite Volcano-alternating rock particles and
  lava violent eruptions steep mountain

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Types of Volcanoesquiet eruptions

• Shield volcanoes

• Galapagos Island

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Shield Volcanoes

• Mona Loa, Hawaii

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Shield Volcanoes
Volcanoes of Mars
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Shield Volcanoes
Powerline, Hawaii
Fumarole Butte, Utah
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• Famous composite volcanoes include Mount Fuji in
  Japan, Mount Cotopaxi in Ecuador, Mount Shasta
  and Lassen in California, Mount Hood in Oregon,
  Mount St. Helens and Mount Rainier in Washington,
  Mt Pinatubo in the Philipenes, and Mt. Etna in
  Italy.

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Mt. Hood
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Mt. Fugi