Across
- 2. Prove STH
- 7. Big and heavy
- 9. seriousness
- 12. Respiratory disease
- 14. Academic word
- 15. Mountain magma
- 17. Yellow flammable chemical with a pungent odor
- 18. big
- 20. Cause and effect
- 21. influence
Down
- 1. What has always been
- 3. Assume an idea
- 4. strange
- 5. Breath
- 6. Observe something
- 8. destroy
- 10. A major natural disaster
- 11. obvious
- 13. A landform from which magma can erupt
- 16. Speech and speaking
- 19. great