Earth day Puzzle

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Across
  1. 3. maintain (something) in its original or existing state.
  2. 5. (of a natural resource or source of energy) not depleted when used.
  3. 9. the natural home or environment of an animal, plant, or other organism.
  4. 10. convert (waste) into reusable material.
  5. 12. a community of living organisms (plants, animals and microbes) in a particular area
  6. 13. trash, such as paper, cans, and bottles, that is left lying in an open or public place.
  7. 16. 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. in an often hostile environment"
  3. 4. able to be maintained at a certain rate or level.
  4. 6. (of a species, family, or other group of animals or plants) having no living members; no longer in existence.
  5. 7. the sun's rays as a source of energy from which power for domestic or industrial use may be generated.
  6. 8. contaminate (water, air, or a place) with harmful or poisonous substances.
  7. 11. decayed organic material used as a plant fertilizer.
  8. 14. the study of the relationships between living organisms, including humans, and their physical environment
  9. 15. the envelope of gases surrounding the earth or another planet.