Across
- 4. one of the most harmful pollutants
- 7. a system where organisms all connect together
- 9. an animals home
Down
- 1. the thing most plants grow from
- 2. it makes landfills smaller
- 3. the thing that is all around us
- 5. things that clean the air
- 6. one of the main colors of nature
- 8. making sure the earth is not to polluted