Earth Day Crossword

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Across
  1. 2. (of a species, family, or other group of animals or plants) having no living members; no longer in existence.
  2. 3. the envelope of gases surrounding the earth or another planet.
  3. 4. the branch of biology that deals with the relations of organisms to one another and to their physical surroundings.
  4. 6. contaminate (water, air, or a place) with harmful or poisonous substances.
  5. 8. the natural home or environment of an animal, plant, or other organism.
  6. 9. the surroundings or conditions in which a person, animal, or plant lives or operates.
Down
  1. 1. protect (something, especially an environmentally or culturally important place or thing) from harm or destruction.
  2. 2. a biological community of interacting organisms and their physical environment.
  3. 5. decayed organic material used as a plant fertilizer.
  4. 7. trash, such as paper, cans, and bottles, that is left lying in an open or public place.