Earth Day

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Across
  1. 3. / mixture of various decaying organic substances
  2. 7. / to keep something in its original state
  3. 10. / made without chemicals
  4. 11. / the surroundings or conditions in which a person,animal or plant lives
  5. 14. / a place to dispose of garbage and other waste material
  6. 15. / things like air,water and soil together
  7. 17. / contamination of water and air with harmful substances
  8. 19. / sun energy
  9. 20. / to process used goods or waste so as to produce something that is often better
Down
  1. 1. / a layer in the Earth's atmosphere
  2. 2. / layer of gases surrounding a planet
  3. 4. / capable of being supported
  4. 5. / to make something new out of used object
  5. 6. / doesn't exist anymore
  6. 8. / restored or replaced by natural process
  7. 9. / the natural home or environment of an animal,plant or organism
  8. 12. / a substance discharged into the air
  9. 13. / trash on the ground
  10. 16. / to protect something
  11. 18. / deals with the relations of organisms to one another