Happy Earth Day!

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Across
  1. 2. flower
  2. 5. oxygen
  3. 9. plants
  4. 10. garden
  5. 12. protect
  6. 14. air
  7. 16. reuse
  8. 17. environment
  9. 18. land
Down
  1. 1. green
  2. 3. recycle
  3. 4. pollution
  4. 6. grass
  5. 7. conserve
  6. 8. nature
  7. 11. tree
  8. 13. water
  9. 15. birds