Across
- 2. deny
- 3. almost practical
- 7. less water
- 8. unexpected meetings with stuff
- 10. scientific knowledge
- 11. exact
- 16. thing made by humans
- 17. surprisingly small
- 18. protests for protection of nature
- 20. policy makers
Down
- 1. Aspects of mechanical air-craft
- 4. study of nature
- 5. examining something
- 6. dense population
- 9. eating and drinking
- 12. help
- 13. release
- 14. Outside earths atmosphere
- 15. home
- 19. eco friendly