UB STEP:Earth Day 2023

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Across
  1. 3. The natural home of an animal, plant, or other organisms
  2. 5. Decayed organic material used as a plant fertilizer
  3. 7. Source that is not depleted
  4. 8. To reuse materials
  5. 10. It differs from oxygen in having three atoms in its molecule
  6. 11. The envelope of gases surrounding the earth
  7. 12. To reuse a material but making it into something of higher quality
  8. 14. The surroundings or conditions in which a person, animal, or plant lives or functions
  9. 16. Determined by the sun
  10. 18. Relating to a state of being maintained
Down
  1. 1. Contaminated with harmful and poisonous substances
  2. 2. A place to dispose of materials
  3. 4. Trash, such as paper, cans, and bottles
  4. 6. No longer alive, gone
  5. 9. A branch of biology that deals with the ecosystem
  6. 13. To maintain in its original state
  7. 15. The production and discharge of gas or radiation
  8. 17. Relating to or derived from living matter