Vocabulary

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Across
  1. 3. drought
  2. 4. planet
  3. 6. to threaten
  4. 9. to replace
  5. 10. to decrease
  6. 12. to suport
  7. 13. environment
  8. 16. to protect
  9. 18. to value
  10. 20. development
Down
  1. 1. ground
  2. 2. oil
  3. 5. ozone layer
  4. 7. future
  5. 8. to reuse
  6. 11. to breathe
  7. 14. to keep informed
  8. 15. invention
  9. 17. erosion
  10. 19. to vote