Across
- 4. seasonal wind that brings dry or moist air
- 6. a system animals and plants
- 7. die out
- 8. semi dry grasslands or prairies
- 9. the clearing of trees
- 11. where 2 air masses meet
- 12. spread of desert like conditions
- 15. living thing
- 16. decayed plant or animal remains
- 17. permanently frozen layers of soil
- 19. the planting of trees
- 20. surroundings
Down
- 1. oil and gasoline
- 2. place where plants and animals live
- 3. resources that cannot be replaced
- 5. the change of air in a climate
- 10. resources that can be replaced
- 13. any material in nature that people can use
- 14. the usual weather
- 18. areas of tall grasses and a few trees