Across
- 3. A piece of land almost surrounded by water or projecting out into a body of water
- 6. A piece of land completely surrounded by water
- 8. Closely related group of islands
- 10. A man-made artificial route
- 12. Variety of species in an ecosystem
- 13. Permanently frozen ground
- 15. Gradual transition from fertile to less productive land
- 18. Protection of the environment
Down
- 1. Unfit for use due to the presence of unsafe atoms
- 2. Flat land found in arctic and subarctic regions
- 4. Tropical grasslands
- 5. The height above sea level
- 7. A region drained by a river system
- 9. Very dry with extremely high daytime temperatures
- 11. Hurricanes that bring heavy rain and
- 14. Giving off energy caused by the breakdown of atoms
- 16. The way people live and act
- 17. Complete control of the market