Across
- 1. Vanished or no longer living
- 2. Trash in a public place
- 6. Envelope of gases surrounding Earth
- 8. Decayed material used as plant fertilizer
- 9. Relating to living matter
- 10. Surroundings in which we live
- 11. Energy not depleted by use like water
Down
- 1. Production and discharge of gas or radiation
- 3. Biological community of interacting organisms
- 4. Natural home of an animal or plant
- 5. Maintain in original state
- 7. Reuse discarded material or objects