Across
- 6. all living and nonliving things
- 7. convert waste into something that can be used
- 9. recycle with organic materials
- 10. recycle to make a product of higher value
- 12. something that will not go away
- 14. study of organisms and their environment
- 16. 03, chemical in the atmosphere
- 17. when a species is wiped out
- 18. trash
- 19. naturally replenished energy
Down
- 1. living matter
- 2. to make last as long as possible
- 3. layer of gas around the planet
- 4. a place where trash is left forever
- 5. to add pollution
- 6. gas released into the air
- 8. interacting organisms in an environment
- 11. to save or protect something
- 13. sun's energy
- 15. where an animal lives