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Across
  1. 2. Steep cliff edge
  2. 5. Powerful waterfalls
  3. 10. Crack in Earth's crust
  4. 11. Glacier ice crack
  5. 12. Large free-standing rock
  6. 15. Coastal water inlets
  7. 16. Shallow coastal water bodies
  8. 19. Coastal shallow waters
  9. 20. Vast treeless plains
  10. 22. Bowl-shaped landform
  11. 23. Land by the sea
  12. 27. Mountain range system
  13. 28. Natural waterway
  14. 30. Areas with dense trees
Down
  1. 1. Wetlands with waterlogged soils
  2. 3. Stream of molten rock
  3. 4. Natural water drainage area
  4. 6. Treeless Arctic region
  5. 7. Prominent coastal land
  6. 8. Low-lying landforms
  7. 9. River-carved valleys
  8. 13. Open grassy region
  9. 14. Mountain's highest points
  10. 17. Narrow land strip
  11. 18. Safe shelter for ships
  12. 21. Flat elevated landform
  13. 24. Large underground spaces
  14. 25. Deep oceanic valley
  15. 26. Forested subarctic region
  16. 29. Mountain's highest point