Across
- 2. a series of huge tidal waves
- 6. sudden shake of the earth's crust
- 7. a numerical scale for expressing the magnitude of an earthquake
- 8. outer covering of the earth
- 9. a period of abnormally low rainfall
Down
- 1. a sudden accident that causes great damage
- 3. pieces of Earth's crust and uppermost mantle
- 4. a mountain that opens downward to a pool of molten rock
- 5. an instrument used to measure and record details of the earthquake