Across
- 6. conditions in which something lives
- 7. turns waste into usable material
- 9. decayed organic material
- 10. reuse objects to create a higher quality product
- 12. able to be maintained
- 14. branch of biology that deals with relation of organisms
- 16. unstable toxic gas
- 17. no longer in existence
- 18. trash left in an open environment
- 19. capable of being renewed
Down
- 1. relating from living matter
- 2. maintain its original state
- 3. gases surrounding the earth
- 4. a place to dispose of waste material
- 5. contaminate with harmful substances
- 6. discharge of radiation & gases
- 8. interacting organisms in their environment
- 11. protect from harm
- 13. relating to the sun
- 15. natural home or environment