G chapter 2

2. Anything in the environment that humans use
4. management of soil to prevent destruction
6. Rocks that break down on Earths Suface physically and chemically
9. thick mass of grass roots and soil
11. rocks broken down chemically
13. The crumbly, topmost layer of soil, mixture of humus, clay, and other minerals
14. A soil organism that breaks down the remains of organisms and digests them
16. Dark colored organic material in soil
18. type of soil that is made up of about equal parts of clay, sand, and silt
19. Chemical change when when a substance combines with oxygen
21. Method which dead stalks from the previous years crops are left in the ground to hold soil in place
22. Darker contour line on a topographic map that rounds elevation units
23. When water, ice, wind, or gravity moves weathered rock or soil
24. Loose layer and dead plant leaves and stems on the Suface of the soil
25. area of the Great Plains where wind erosion caused soil loss in the 1930s

1. A material that is full of tiny connected air spaces that water can seep through
3. Principle that states that earth surface changed the same way forever
4. Horizon Layer of soil that differs in color and texture
5. rocks broken down physically
7. The distance in elevation from Contour line to Contour line
8. Layer of soil beneath the topsoil, contains clay and other minerals
10. measure of how well soil supports plant growth
11. Line that connects points with the same elevation on a topographic map
12. Planting of different crops in fields each year to maintain soils fertility
15. A map that shows Suface area
17. The process when water seeps into cracks, freezes and expands
20. Grinding away of rock by other rock particles carried in ice, water,or wind
21. plowing fields along curves of slopes to prevent soil loss
26. Solid layer of rock beneath the soil