Earth Day

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Across
  1. 3. Trash left lying somewhere
  2. 6. Production and release of gas
  3. 7. Surrounding of an organism
  4. 9. Study of organisms relations
  5. 10. Gas protecting us from the sun
  6. 12. Place of living
  7. 14. Gone forever
  8. 16. Keep safe
  9. 19. Ruin or contaminate
Down
  1. 1. Places for waste to go to
  2. 2. Able to be used
  3. 4. Waste that is reused
  4. 5. Organic material used as fertilizer
  5. 8. Community of interacting organisms
  6. 11. From nature
  7. 13. Keep in original state
  8. 15. Layer of gas surrounding a planet
  9. 17. Able to be reused
  10. 18. Energy coming from light