Across
- 2. Mountain created by liquid rock
- 4. Deep narrow valley
- 6. Area in a desert with water and plants
- 7. Large body of ice slowly moving
- 9. Area of land drained by a specific river and its' branches
- 11. Flat open area
- 14. A natural stream of water
- 15. Set of islands
- 18. Steep rock wall
Down
- 1. Land with steep sides that stretches higher than a hill
- 3. Small stream flowing into a larger one
- 5. Low-lying land at the mouth of a river with soil built up
- 8. Group of rocks and coral
- 10. Narrow stretch of water joining two larger bodies of water
- 12. A body of water surrounded by land
- 13. Land surrounded by water
- 16. An elevated area of land
- 17. Largest body of water