Across
- 3. Chemical symbol for water
- 4. Basic unit of matter
- 6. Author of "Romeo and Juliet"
- 9. Food breakdown
- 11. Large sea mammal
- 12. Closest planet to the Sun
- 13. Rock breakdown process
- 14. High-pitched laugh
- 16. Earth's Atmosphere Study
- 18. Capital of France
- 19. Force of attraction
- 20. Earth's satellite
Down
- 1. Caterpillar transformation
- 2. Sun-powered plant process
- 5. Basic unit of life
- 7. Celestial study
- 8. Unit of distance
- 10. Australian bird
- 15. Big cat
- 17. Vaporization