Across
- 2. layer of soil that differs in color and texture from the layers around it
- 5. organic material that is found in soil
- 6. layer of dead plants and/or leaves on the surface
- 7. physically breaks down rock
- 13. chemically breaks down rock
- 14. when the Great Plains lost all soil by wind erosion in 1930s
- 19. mass of roots of grass and soil
- 20. moves rock and soil
- 23. shows features on land
- 26. made equally out of clay sand and silt
- 29. geological principle
Down
- 1. section of soil that is what plants are mostly planted in
- 2. management of soil destruction
- 3. plowing soil around slope edges to prevent loss of soil
- 4. anything that is natural that can be used by humans
- 8. method in which dead plants are left to hold soil in place
- 9. show how much space between contour lines
- 10. bold contour line
- 11. breaks down rocks at Earths surface
- 12. measure of support in plant growth
- 15. layer of soil that is made up of clay and other minerals
- 16. hard layer of rock that is beneath the soil
- 17. method of switching crops each year to keep fertility up
- 18. shows measurements of elevation
- 21. loose material that plants grow in
- 22. organism that breaks down remains of organisms
- 24. name for mineral with tiny holes that water can seep through
- 25. cause of potholes
- 27. grinds off rock particles by water ice and wind
- 28. cause of rust