Earth Day Puzzle

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Across
  1. 2. Convert waste into reusable material
  2. 4. Water, air, or a place with harmful or poisonous substances
  3. 7. The sun's rays as a source of energy from which power for domestic or industrial use may be generated
  4. 9. A biological community of interacting organisms and their physical environment
  5. 13. Short for ozone layer
  6. 14. The surroundings or conditions in which a person, animal, or plant lives or operates
Down
  1. 1. To keep safe from injury, harm, or destruction
  2. 3. Decayed organic material used as a plant fertilizer
  3. 5. A place to dispose of refuse and other waste material by burying it and covering it over with soil
  4. 6. Produced or involving production without the use of chemical fertilizers, pesticides, or other artificial agents
  5. 8. The envelope of gases surrounding the earth or another planet
  6. 10. Protect something from harm or destruction
  7. 11. Able to be maintained at a certain rate or level
  8. 12. A species having no living members