Across
- 2. thawing and freezing of water I between two rocks
- 4. switching the crops each year to increase fertility rate of soil
- 6. the solid layer of rock under earths surface
- 7. the heavier contour lines
- 12. anything in nature that humans use
- 14. the process of rock removal with chemicals
- 16. the way earth has changed over time
- 18. change of set contour lines
- 19. mostly clay soil that is under the topsoil
- 22. map that uses line to show elevations
- 28. lines on a topographic map
Down
- 1. process that breaks down rock
- 3. trying to preserve dirt
- 5. the movement of weathered rock
- 8. layer of dead organic material
- 9. how we'll soil supports growth
- 10. a change when substances rusts
- 11. physical weathering
- 13. the top layer of soil
- 15. In the Great Plains in 1930's the _______caused soil soil
- 17. dark organic material in soil
- 19. thick mass of roots and soil
- 20. fertile soil
- 21. the layers of different soil
- 23. tiny holes where water is able to seep through
- 24. plowing on a curve to prevent soil loss
- 25. when rock particles change the shape of a rock over time
- 26. I dug in the ____ to find worms.
- 27. Worms are a type of _____.