Chapter two

2. conservation- management to prevent soil destruction.
7. dead plants, leaves, and stems on earths surface.
8. rotation- reverting soils fertility by planting different crops.
9. process where water, ice, wind, or gravity moves rock or soil.
11. weathered surface material that plants grow on.
12. plowing- conservation method in which dead stalks from the previous years crops are left in the ground.
13. resource- anything in the environment that humans use.
14. chemical change which a substance imbibes with oxygen, forming rust.
16. weathering- chemical changes that break rock.
17. chemical and physical processes that break down rock
18. bowl- where wind erosion caused soil loss during the 1930's.
19. weathering- rock physically breaking into smaller pieces.
22. soil organisms that break down remains of organisms and digests them.
23. soil beneath topsoil mostly made of clay.
24. wedging- when water slips into cracks, then freezes and expands.
25. fertile soil that is made of clay, sand, and silt.
26. a thick mass of grass and roots.

1. topmost layer of soil made of clay, humus, and other minerals.
3. contour- a heavy contour line that's elevation is measured in round untis.
4. water, ice, or wind grinding away of rock
5. solid layer of rock under the soil.
6. map- map that shows surface details.
10. processes that operate today operated in the past to change earths surface.
15. dark colored organic material in soil.
16. plowing- preventing soil loss by plowing curves of a slope.
20. characteristic that is full of air spaces that water can seep into.
21. how well soil supports plant growth.