THE ENVIRONMENT

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Across
  1. 4. waste/in landfill
  2. 6. to live in
  3. 7. gases
  4. 8. resources that can be replaced naturally
  5. 9. burning the gas
Down
  1. 1. of being broken down by bacteria
  2. 2. gases
  3. 3. to be maintained
  4. 5. quickly