Class 7a: Volcanoes. Volcanism Vulcanism: origin and movement of molten rock Volcanism: extrusive activity.

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Presentation transcript:

Class 7a: Volcanoes

Volcanism Vulcanism: origin and movement of molten rock Volcanism: extrusive activity

Volcanism About 1300 worldwide

Geography of volcanism Sea-floor spreading and rift zones Subduction zones Hot spots

Styles of eruption Based on chemistry Also viscosity (thickness)

Effusive eruptions At hot spots or sea-floor spreading

Effusive eruptions Shield volcanoes

Explosive eruptions Along subduction zones

Explosive eruptions Composite volcanoes

Caldera Caldera: volcano collapses on top of empty magma chamber

Predicting eruptions