Across
- 3. something that is weighed down so it won't move
- 5. the period of time when a volcano is resting
- 6. a small earthquake or shaking
- 8. an instrument that measures earthquakes
- 9. bursting or breaking open
- 10. the size of something, such as an earthquake
- 12. happening suddenly or not planned
Down
- 1. a sudden powerful movement forward or upward
- 2. someone who studies volcanoes
- 4. relating to the earth
- 7. leaving a dangerous area to go to a safer area
- 11. the study of