Earth Day Crossword Puzzle!

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