Across
- 1. discharge of something
- 4. the original or existing state.
- 9. living organisms
- 10. chemical formula
- 12. relating to or derived from living matter
- 13. where animals live
- 15. reuse them again and again
- 16. create a product of higher quality or value than the original.
- 18. poison gas or air
- 20. certain rate or level
Down
- 2. determined by the sun
- 3. protection from harm or danger
- 5. surrounding of humans and animals
- 6. study of living organisms
- 7. gases surrounding the earth or another planet
- 8. burying dispose
- 11. no longer lives
- 14. capable of being renewed
- 17. plant fertilizer
- 19. trash in the ground in public places