Earth Day Project

1234567891011121314151617181920
Across
  1. 6. contaminate (water, air, or a place) with harmful or poisonous substances
  2. 7. no longer in existence
  3. 8. convert (waste) into reusable material
  4. 12. relating to or derived from living matter
  5. 13. the production and discharge of something, especially gas or radiation
  6. 14. something related to the sun
  7. 15. protect something from harm or danger
  8. 17. able to be maintained at a certain rate or level
  9. 19. a colorless unstable toxic gas with a pungent odor and powerful oxidizing properties, formed from oxygen by electrical discharges or ultraviolet light. It differs from normal oxygen (O2) in having three atoms in its molecule
  10. 20. able to be renewed
Down
  1. 1. the branch of biology that deals with the relations of organisms to one another and to their physical surroundings
  2. 2. maintain something in its original or existing state
  3. 3. reuse
  4. 4. trash thrown into a public or open space
  5. 5. the natural home or environment of an animal, plant, or other organism
  6. 9. decayed organic material used as plant fertilizer
  7. 10. a biological community of interacting organisms
  8. 11. the conditions in which a human, plant, or animal lives/operates
  9. 16. envelope of gases that surrounds the earth
  10. 18. a place to dispose of refuse and other waste material by burying it and covering it over with soil, especially as a method of filling in or extending usable land