1. Volcanic Eruptions (or Volcanoes are Cool)
Types of Eruptions.
Types of Volcanoes.
Volcano energy
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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…
Galapagos Island
Shield volcanoes
Mona Loa, Hawaii
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9. Volcanoes Composite Violent eruptions
Cone like structure build upon layers of igneous rock, ash, lava, and pumice.
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10. Cinder cone Volcanoes
Small cone volcanos; erupt violently; Spray lave like a fountain.
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11. Energy in volcanoes
Heat Energy; Mechanical energy; Sound energy, light energy; wave energy
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