Across
- 4. a region of parallel mountain chains
- 6. the measure of how much above or below sea level a place is
- 7. an underground layer of rock through which water flows
- 9. a flat, treeless plain with permanently frozen ground
- 11. a fine-grained, fertile soil deposited by the wind
- 12. the process of collecting water and using it to water crops
- 13. a group or chain of islands
- 17. the animal life in a particular environment
- 18. describes an area that is lightly populated
- 19. deep and narrow valley with steep walls
- 20. a partly dry grassland often found at the edge of a desert
- 21. a large area of sand
Down
- 1. a body of land jutting into a lake or ocean, surrounded on three sides by water
- 2. the process by which an area turns into a desert
- 3. a dry riverbed that fills with water when rare rains fall in desert
- 5. a fertile area that rises in a desert where water is regularly available
- 8. describes an area that is densely populated
- 10. the plant life of a particular environment
- 14. having access to a major coastline (sea or ocean)
- 15. a wide strait or waterway between two landmasses; a course for a river to flow through
- 16. a small river that flows into a larger river