Earth Day

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Across
  1. 2. To make dirty
  2. 5. Made by nature
  3. 6. To prevent waste
  4. 8. Fumes from vehicles
  5. 12. The air surround the earth
  6. 17. External conditions or surroundings
  7. 18. To use again
  8. 19. To process used good to make better
Down
  1. 1. Branch of Science that studies organisms and their environment
  2. 3. Place to dispose of trash
  3. 4. To keep safe
  4. 7. To be able to use continuously
  5. 9. Light and heat from the Sun
  6. 10. Protects the earth from ultraviolet rays
  7. 11. Decaying material used for fertilizer
  8. 13. The place where an organism lives
  9. 14. No longer living
  10. 15. Able to be again
  11. 16. Scattered Trash
  12. 17. Organisms and their environment working together