Across
- 2. place to conduct research
- 3. program; plan
- 7. up to now; until now
- 9. of or relating to the sun
- 13. a scientist who specializes in physics
- 14. test; examine
- 15. plant house
- 17. complicated
- 19. large heavenly body revolving around the sun
- 20. in the direction of the hands of a clock
- 21. think about; recognize
Down
- 1. harmony; equal
- 4. territories; communities
- 5. germs; organisms
- 6. ecosystem; atmosphere
- 8. garbage; trash
- 10. revolves around a planet or moon
- 11. imaginative story
- 12. make
- 16. hazardous; bad
- 18. part; component