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Across
  1. 4. World's highest mountain range.
  2. 6. World's highest mountain.
  3. 9. High, flat land.
  4. 11. Longitude line.
  5. 13. A broad inlet of the sea.
  6. 17. World's longest river.
  7. 19. Island group.
  8. 21. A very large expanse of sea.
  9. 23. Flat arctic region.
  10. 24. Steep-sided inlet.
  11. 25. River-mouth landform.
Down
  1. 1. Land bridge.
  2. 2. World's largest rainforest.
  3. 3. World's largest hot desert.
  4. 5. Steep-sided hill.
  5. 7. Tropical grassland.
  6. 8. Slow-moving ice mass.
  7. 10. River-carved gorge.
  8. 12. Wind-shaped sand hill.
  9. 14. Distance north or south of the equator.
  10. 15. A barren area of land.
  11. 16. Lava-erupting mountain.
  12. 18. Imaginary Earth divider.
  13. 20. Large landmass.
  14. 22. Longest range in South America.