Across
- 3. Low-lying water collection
- 4. Underwater reef builders
- 7. Pathway through mountains
- 9. Hot water eruption
- 11. Large water bodies
- 13. Steep river valleys
- 14. Arctic treeless biome
- 15. Sharp mountain peak
- 18. High steep cliff
- 20. Desert watercourse
- 22. Low rounded elevations
- 24. Small mountain lake
- 26. Flat-topped highland
- 29. Flowing watercourses
- 30. Fine soil deposit
Down
- 1. Large underground chamber
- 2. Vast grassy plains
- 5. Shallow water enclosed
- 6. Low-lying valleys
- 8. Arid sandy expanses
- 10. Water emerging naturally
- 12. Tropical grassland ecosystem
- 16. U-shaped river loop
- 17. Land near sea
- 19. Sea inlet with cliffs
- 21. Isolated steep hill
- 23. Flat rocky edge
- 25. Safe docking area
- 27. Thin land connection
- 28. Related to glaciers