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