Across
- 2. A curved rock formation caused by erosion
- 3. Permanently frozen ground found in polar regions
- 4. A dry, barren landscape with little rainfall
- 6. A coastal landform that extends into the sea
- 9. The process of wearing away land by wind, water, or ice
- 11. A hollow space in rock or underground
- 14. The variety of life in a particular ecosystem
- 15. A low area between hills or mountains
- 16. A hill of sand shaped by wind
- 17. A flat elevated landform
- 18. A deep valley with steep sides, often carved by a river
- 19. A raised area of land lower than a mountain
- 21. Related to Earth's structure and movement of plates
- 24. A large mass of ice moving slowly over land
- 25. A deep glacial valley filled with seawater
Down
- 1. The breakdown of rocks by natural forces
- 5. A cold, treeless landscape with frozen ground
- 7. The laying down of sediment by wind, water, or ice
- 8. A deep narrow valley with steep sides
- 10. A large natural elevation of the Earth's surface
- 11. The boundary between land and sea
- 12. A mountain formed by lava and eruptions
- 13. A large ocean wave caused by an underwater earthquake or eruption
- 17. A large, flat expanse of land
- 20. The sudden movement of rock and soil down a slope
- 22. A fertile spot in a desert where water is found
- 23. A steep rock face, especially by the sea