Across
- 2. (Study of ecosystems)
- 4. (Microscopic organisms)
- 7. (Basic unit of matter)
- 8. (Study of celestial objects)
- 9. (Study of matter and energy)
- 11. (Study of the Earth's structure and history)
- 15. (Genetic material)
- 17. (Force of attraction or repulsion)
- 18. (Device for viewing small objects)
- 20. (Process of gradual change)
Down
- 1. (Chemical structure)
- 3. (Force that pulls objects together)
- 5. (Study of matter and its properties)
- 6. (Process in plants to convert sunlight into energy)
- 10. (Related to the sun)
- 12. (Community of living organisms)
- 13. (Study of heredity)
- 14. (Basic unit of life)
- 16. (Device for observing distant objects)
- 19. (Capacity to do work)