Across
- 2. the rock beneath soil
- 5. organic material in soil
- 9. Dead stalks from the pervious year's crops are left in the ground to hold the soil in place
- 11. ____ _____ is the area of the Great Plains where wind erosion caused a loss of soil duringt he 1930's
- 12. Different crops planted ina field each year to mantain the soils fertility
- 13. Breaking down rocks, minirals, ect
- 14. ___ ____ is the layer of soil that has clay, humus, and other materials
- 15. anything the enviornment that humans can use
- 16. difference in line elevation
- 18. The removal of particals by wind, water, ice, and gravity
- 19. _____ ______ is the process wich ice is in a rock creating a depper crack
- 20. Uses contor lines
- 21. loose layer of dead plants, and ect on the top of the soil
- 22. This princible states that the same process that operated in the past operats today
- 25. plowing areas to prevent lose of soil
- 26. _____ _____ is a marking of the number on a contor line
- 29. Soil that differs in colorand textures from the oter layers
Down
- 1. Grinding away by rock particals
- 3. Lines of same elevation
- 4. Chemically Broken down
- 6. Physiclly broken down
- 7. a type of soil that is rich and fertile
- 8. ______ is mixed with iron to make the color
- 10. Weathered material on earths surface
- 17. mass of groups of soil and roots
- 23. how well soil supports plant groth
- 24. Managment to protect the soil
- 27. breaks down the remains of organisms and oter things
- 28. layer beneath the top soil