Across
- 6. characteristic of materials that are full of tiny air spaces that water seeps through
- 8. process where rock splits when water gets seeps into cracks and expands
- 9. plowing fields on slopes to prevent soil loss
- 12. grinding away of rock by rock particles carried in wind, water, and ice
- 13. process that breaks down rocks through chemical changes
- 18. layer of soil that differs in color from surrounding layers
- 19. conservation method where the previous year's crops are left to keep soil in place
- 22. layer of dead plant leaves and stems on the surface
- 23. process where water, ice, wind, and gravity move rock and soil
- 24. layer of soil that is beneath the topsoil and is made up of clay and other minerals
- 25. mixture of humus, clay, and other minerals and is the top layer of soil
- 26. measure of how soil supports plant growth
- 27. the heavier contour line that shows the elevation
Down
- 1. area in the Great Plains where wind erosion caused soil loss
- 2. map that shows the elevation of an area
- 3. processes that break down rock
- 4. principle that the same processes today were operated in the past
- 5. thick mass of grass and soil
- 7. anything in the environment that a human uses
- 10. type of weathering where rock is physically broken down
- 11. layer of rock beneath the soil
- 14. fertile soil that is made up of clay, sand, and silt
- 15. organic material in soil
- 16. loose material at earths surface that plants grow in
- 17. line on a topographic map that connects points of elevation
- 19. difference in elevation from contour line to contour line
- 20. management of soil to prevent its destruction
- 21. chemical change where oxygen forms with other substances and forms rust
- 28. soil organism that breaks down remains of organisms and digests them
- 29. planting of different crops every year to maintain the soils fertility