1. Volcanic Eruptions (or Volcanoes are Cool)
Types of Eruptions.
Types of Volcanoes.
Volcanoes and Plate Tectonics.
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2. Eruptions are Classified as:
Quiet………or
Violent!
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3. Quiet Eruptions
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4. Violent Eruptions
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5. 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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6. 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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7. 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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8. Types of Volcanoes: quiet eruptions…
Shield volcanoes
Galapagos Island
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9. Shield Volcanoes
Mona Loa, Hawaii
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10. Shield Volcanoes
Volcanoes of Mars
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11. Shield Volcanoes
Powerline,
Hawaii
Fumarole Butte, Utah
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