Environment puzzle

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Across
  1. 2. Baby tree
  2. 3. Capable of being decomposed
  3. 8. Very small plant
  4. 10. Diagram showing what animals eat
  5. 11. Part of Earth where ecosystems operate
  6. 14. Mass of air surrounding the Earth
  7. 15. "Reduce,____,recycle"
  8. 17. Protect from harm or maintain
  9. 18. Study of environments
Down
  1. 1. Natural home or environment
  2. 4. Removal of trees
  3. 5. Surroundings in which a living organism lives
  4. 6. Plants of a region
  5. 7. Flora's partner
  6. 9. Large ecological areas with flora and fauna
  7. 10. Large wooded area
  8. 12. Interacting system in which living organisms interact with the non living
  9. 13. Useful or edible plant
  10. 16. Foliage or vegetation
  11. 19. Combustible and vital gas