Across
- 2. geology
- 6. researcher
- 9. liquid
- 10. energy
- 11. particle
- 14. reaction
- 17. mutation
- 18. discovery
- 19. reflection
- 20. research
- 21. molecule
Down
- 1. anatomy
- 3. substance
- 4. universe
- 5. theory
- 7. tissue
- 8. magnet
- 10. radiation
- 12. light
- 13. hypothesis
- 15. fossil
- 16. microscope