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