Across
- 5. Resources that cannot be replaced.
- 8. Decayed plants and animals matter.
- 9. Warm current that flows north along the U.S. Coast.
- 11. Place where plants and animals live.
- 13. Grasslands or prairies.
- 14. Remains of ancient plants and animals.
- 15. When two air masses of different temperatures.
- 17. Frozen layers of soil.
- 19. Desert like conditions.
Down
- 1. Electricity from waterpower.
- 2. Areas of tall grasses and scattered trees.
- 3. Brings either dry or moist air.
- 4. Surroundings.
- 6. Resources Earth replaces naturally.
- 7. Material in nature that people use and value.
- 10. A group of plants and animals depends on each other.
- 12. Region's average weather conditions over a long period.
- 14. The place where two air masses of different moisture.
- 15. Changes in the air for a given place and time.
- 16. To die out of.
- 18. Planting trees to replace.
