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Across
  1. 3. Vast arid region
  2. 6. Amount of precipitation
  3. 8. Oceanic ground terrain
  4. 12. Mountain's highest point
  5. 14. Piled stones landmark
  6. 15. Hot spring eruption
  7. 16. Area draining to a river
  8. 18. Low area between hills
  9. 19. Moving ice body
  10. 21. Coastal shallow lake
  11. 22. Large Earth crack
  12. 26. Glacier debris ridge
  13. 27. Base of a mountain
  14. 29. Erupting mountain
  15. 30. Large water inlet
Down
  1. 1. Marine biodiversity structure
  2. 2. Large water collection area
  3. 4. Steep rock face
  4. 5. Small sheltered bay
  5. 7. Deep sea inlet
  6. 9. Underground water reservoir
  7. 10. Coastal swamp trees
  8. 11. Inland remote area
  9. 13. Floating ice mass
  10. 17. Group of islands
  11. 20. Shelter for ships
  12. 23. Deposited earth particles
  13. 24. Smaller sea inlet
  14. 25. High steep bank
  15. 28. Narrow land connection