G chapter 2

2. Rocks that break down on Earths Suface physically and chemically
5. A material that is full of tiny connected air spaces that water can seep through
6. area of the Great Plains where wind erosion caused soil loss in the 1930s
7. Planting of different crops in fields each year to maintain soils fertility
8. The crumbly, topmost layer of soil, mixture of humus, clay, and other minerals
10. When water, ice, wind, or gravity moves weathered rock or soil
11. thick mass of grass roots and soil
12. Dark colored organic material in soil
14. management of soil to prevent destruction
17. Method which dead stalks from the previous years crops are left in the ground to hold soil in place
19. Principle that states that earth surface changed the same way forever
20. The distance in elevation from Contour line to Contour line
23. plowing fields along curves of slopes to prevent soil loss
24. A map that shows Suface area
25. A soil organism that breaks down the remains of organisms and digests them
26. Loose layer and dead plant leaves and stems on the Suface of the soil
28. Line that connects points with the same elevation on a topographic map

1. rocks broken down chemically
3. Anything in the environment that humans use
4. Horizon Layer of soil that differs in color and texture
9. Grinding away of rock by other rock particles carried in ice, water,or wind
11. Layer of soil beneath the topsoil, contains clay and other minerals
13. rocks broken down physically
15. The process when water seeps into cracks, freezes and expands
16. Darker contour line on a topographic map that rounds elevation units
18. Solid layer of rock beneath the soil
21. measure of how well soil supports plant growth
22. Chemical change when when a substance combines with oxygen
27. type of soil that is made up of about equal parts of clay, sand, and silt