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Across
  1. 3. Multiple mountain tops
  2. 4. Steep valley carved by rivers
  3. 7. Slow-moving marshy stream
  4. 9. Man-made water body
  5. 11. Periodic sea level changes
  6. 14. Spiraling fluid motion
  7. 18. Dense wooded areas
  8. 19. Marsh or swamp region
  9. 21. Grasslands with scattered trees
  10. 24. Narrow passage of water
  11. 25. Fertile spot in desert
  12. 27. Relating to volcanoes
  13. 29. Open grassy lands
  14. 30. Water near shore
Down
  1. 1. Process of land wearing away
  2. 2. Small narrow gorge
  3. 5. Recessed rocky area
  4. 6. Depression from impact or eruption
  5. 8. Land reclaimed from water
  6. 10. Treeless Arctic plains
  7. 12. Vast grasslands
  8. 13. Small flowing stream
  9. 15. Dry barren regions
  10. 16. Related to glaciers
  11. 17. Low wetland region
  12. 20. Land formed by river deposition
  13. 22. Dry stream bed
  14. 23. Flowing small river
  15. 26. Land inclining downwards
  16. 28. Northern forest biome