Earth Day Crossword

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Across
  1. 6. our surroundings
  2. 7. To change one thing to another
  3. 9. decomposed plants
  4. 10. Transforming old products to new products
  5. 12. something that can be sustained
  6. 14. the science of the ecosystem
  7. 16. Layer on the atmosphere
  8. 17. no longer living
  9. 18. trash on the ground
  10. 19. something we can keep making
Down
  1. 1. natural
  2. 2. keep in a certain condition
  3. 3. layers of gas in the air
  4. 4. where the trash goes
  5. 5. to contaminate with harmful chemicals
  6. 6. something cars release into the air
  7. 8. all life in an area
  8. 11. to save
  9. 13. coming from the sun
  10. 15. a home to an animal