Across
- 4. Rock made of ash
- 5. A deadly mountain
- 11. A big wave
- 13. Converging plates
- 15. Eruption Power scale
- 16. Cars turning at high speed
- 18. The moving crust of the earth
- 20. A Large tremor
Down
- 1. Expulsion of material
- 2. The meeting place of continental plates
- 3. Consistently erupting volcano
- 6. Rock avalanche
- 7. Black, glassy rock
- 8. The worst part of pizza
- 9. Study of the physical world
- 10. Johnny Cash song
- 12. Famous Pokemon trainer
- 14. The ledge above a fire
- 17. Grey rock, sounds like a common seasoning
- 19. Very hot rock