Chapter 2

2. rich soil that is made from clay, sand, and silt
5. weathering process that breaks down rocks chemically
6. dark colored organic material in the soil
7. area of the Great Plains where wind erosion cause lack of soil in the 1930's
10. anything found in nature that humans use
13. layer in soil that is a different color from the ones above and below it
14. the geological principle that uses the same process as in the past as we do today
17. plowing fields to prevent soil loss around curves
19. map using contour lines to show an elevation of an area
20. the process that uses water, wind, ice, or gravity to move weathered rock and soil
21. chemical change that when mixed with oxygen creates rust
22. conservation method that uses dead stalks to keep soil in place for next years crops
24. a darker contour line that is labeled with the elevation
25. lines on a topographic map used to show the elevation
27. layer of soil underneath the topsoil that is mostly made of clay
28. water the seeps into cracks, freezes, and then expands
29. humus, clay, and other minerals that forms on the uppermost layer of soil

1. when a material has oxygen holes that water seeps through
3. the grinding away of rocks using water, ice, or wind
4. type of weathering that is physically broken into pieces
8. planting crops in a different lace each year to keep soil fertile
9. measurement of how well plants grow
11. loose layer of dead plants and stems on the surface of soil
12. thick bunch of grass roots and soil
15. solid layer of rock beneath the soil
16. the process that uses either chemical or physical changes to break down earths surface
18. material on earths surface in which pants grow
22. the difference in elevation from one contour line to another
23. management of soil to prevent destruction
26. soil organism that breaks down other organisms