Across
- 2. decayed plant or animal matter
- 4. areas of tall grasses and scattered trees and shrubs
- 8. the short term changes in the air for a given place and time
- 10. recources that cannot be replaced
- 11. clearing of trees
- 15. a region's average weather conditions over a long period
- 16. surroundings
- 19. winds that blow in the same direction over areas of earth
- 20. permanently frozen layers of soil
Down
- 1. large streams of surface seawater
- 3. semidry grasslands or prairies
- 5. seasonal winds that bring either dry or moist air
- 6. the place where two air masses meet
- 7. spreading of desertlike conditions
- 9. place for an animal or plant to live
- 12. died out
- 13. coal for example
- 14. resources earth replaces naturally
- 17. planting trees to replace lost forestland
- 18. place for multiple animals to live