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Across
  1. 4. Moist air.
  2. 5. Underwater range.
  3. 7. Underwater ridge.
  4. 9. Rolling hills.
  5. 10. African river.
  6. 13. Molten rock.
  7. 14. Earth science.
  8. 17. Shallow coastal water.
  9. 20. Mountain forming.
  10. 21. Preserved remains.
  11. 23. Crust fracture.
  12. 24. Ground shaking.
  13. 25. Sea connector.
Down
  1. 1. Wearing away land.
  2. 2. Earth model.
  3. 3. Region in Russia.
  4. 6. Pacific-Arctic strait.
  5. 8. Frozen ground.
  6. 11. Flat-topped hill.
  7. 12. Surrounded by land.
  8. 15. South American river.
  9. 16. Low-lying area.
  10. 18. Long dry period.
  11. 19. European peninsula.
  12. 22. Flat grassland.