Across
- 2. to use again
- 5. contamination
- 7. opposite of dirty
- 9. large bodies of water
- 10. trees,shrubs,flowers,etc.
- 11. a liquid substance that sustains life
- 12. to keep in current condition
Down
- 1. to make smaller
- 3. the study of how one thing interacts with other things
- 4. a big round object circling a sun
- 6. trash not in trash can
- 8. convert waste into usable materials