Across
- 4. Something that can be used again and again
- 7. A species that no longer exists
- 8. A Molecule composed of three oxygen molecules
- 9. The environment that animals live in
- 10. Living matter
Down
- 1. The energy that the sun produces
- 2. Trash not disposed of properly
- 3. Where most trash goes once it's thrown away
- 5. broken-down organic matter.
- 6. The layer of gases surrounding Earth