Vocabulary: Our Earth

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Across
  1. 6. Saving or protection
  2. 7. Safety measures
  3. 8. A narrow valley
  4. 9. Important
  5. 12. Unavoidable
  6. 14. unpopulated
  7. 15. Sediment
  8. 16. Raised land
Down
  1. 1. Native or original
  2. 2. Process of weathering away
  3. 3. Insufficient
  4. 4. The quality of air in a place
  5. 5. From time to time
  6. 10. Increase rapidly in number
  7. 11. Encouragement/motivation
  8. 13. An area controlled by powerful country