Across
- 6. The surroundings in which an organism lives
- 7. To convert waste into reusable things
- 9. Organic Material used as fertilizer for plants
- 10. To reuse something that will make it a product of better quality
- 12. Able to be maintained
- 14. The study of organisms
- 16. A gas that is a natural part of the environment
- 17. An organism that is no longer existing
- 18. Trash left lying in an open space
- 19. Something that is not deprived when used
Down
- 1. Created from living matter
- 2. To maintain something in its original state
- 3. The gases that surround the Earth
- 4. A place to get rid of trash by burying it and covering it with soil
- 5. The act of contaminating an environment
- 6. The production/discharge of something, especially gas
- 8. A community of organisms and their environment
- 11. To protect a place or organism
- 13. Relating to or caused by the sun
- 15. The natural home of an organism