Across
- 4. Cascading stream of water
- 8. Cold, treeless plain with frozen subsoil
- 11. Steep, high cliff or bank
- 13. Large mass of ice
- 14. Mountain with a vent for lava and ash
- 15. Fertile area in a desert with water and vegetation
- 16. Large flowing body of water
- 19. Flat, elevated landform
- 20. Long, narrow elevated landform
Down
- 1. Tall landform with a peak
- 2. Large underground chamber or cave
- 3. Deep, narrow gorge with steep sides
- 5. Land surrounded by water on three sides
- 6. Shallow body of water separated from the sea by a barrier
- 7. Dense collection of trees
- 9. Arid, barren land with little rainfall
- 10. Wetland with grasses and shallow water
- 12. Long, narrow inlet with steep sides
- 17. Lowland between hills or mountains
- 18. Deep, narrow passage between cliffs