Across
- 2. hot liquid rock
- 7. take care of natural resources
- 12. beginning of a river
- 16. matter that settles at the bottom of liquid
- 17. imaginary line between the poles
- 18. a decayed substance in soil
- 19. shaking of earths crust
- 20. loss of topsoil by water or wind
- 21. small ditch formed by erosion
Down
- 1. rock and soil move all at once
- 3. top layer of earths crust
- 4. a substance thats never been alive
- 5. runoff precipitation that trickles into streams
- 6. natural formation of rock or soil on earth
- 8. coldest part of earth
- 9. farmers move crops every year
- 10. end of a river that flows into ocean
- 11. 70 percent of earth is covered by
- 13. center of the earth
- 14. outer layer of earth
- 15. soil in which plants grow well