1. Class 7a: Volcanoes

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

3. Volcanism About 1300 worldwide

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

5. Styles of eruption Based on chemistry Also viscosity (thickness)

6. Effusive eruptions At hot spots or sea-floor spreading

7. Effusive eruptions Shield volcanoes

8. Explosive eruptions Along subduction zones

9. Explosive eruptions Composite volcanoes

10. Caldera Caldera: volcano collapses on top of empty magma chamber

11. Predicting eruptions