Earth Day Crossword Puzzle

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Across
  1. 3. Mixture of various decaying organic substances
  2. 5. an environment with air
  3. 6. Capable of being supported
  4. 7. To keep something in its original state
  5. 11. Trash on the ground
  6. 12. sun energy
  7. 13. Made without chemicals
  8. 15. buying or using less
  9. 19. Human-made gases containing chlorine and fluorine
  10. 21. an environment without air
Down
  1. 1. Capable of being broken down by bacteria and other decomposers.
  2. 2. An energy-rich substance (such as coal, oil, or natural gas)
  3. 4. To protect something
  4. 8. restored or replaced by natural process
  5. 9. A substance discharged into the air
  6. 10. Layer of gases surrounding a planet
  7. 14. To make something new out of a used object
  8. 16. The surroundings or conditions in which a person,animal or plant lives
  9. 17. a layer in the Earth's atmosphere; O3
  10. 18. The scientific study that deals with the relations of organisms to one another
  11. 20. The natural home or environment of an animal,plant or organism