vocabulary - class X about nature

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Across
  1. 4. Archipelago
  2. 5. Cave
  3. 6. Island
  4. 9. Field
  5. 10. Sky
  6. 12. Mud
  7. 14. Lake
  8. 15. Air
  9. 17. Hill
  10. 18. Canyon
Down
  1. 1. River
  2. 2. Mountain
  3. 3. Ground
  4. 7. Ocean
  5. 8. Beach
  6. 10. Valley
  7. 11. Sea
  8. 13. Marsh
  9. 14. Land
  10. 16. Forest