G chapter 2

2. type of soil that is made up of about equal parts of clay, sand, and silt
4. The distance in elevation from Contour line to Contour line
5. Principle that states that earth surface changed the same way forever
7. Line that connects points with the same elevation on a topographic map
8. Rocks that break down on Earths Suface physically and chemically
9. Horizon Layer of soil that differs in color and texture
10. rocks broken down chemically
11. Method which dead stalks from the previous years crops are left in the ground to hold soil in place
19. area of the Great Plains where wind erosion caused soil loss in the 1930s
21. Solid layer of rock beneath the soil
22. measure of how well soil supports plant growth
23. Darker contour line on a topographic map that rounds elevation units
25. Planting of different crops in fields each year to maintain soils fertility
26. Loose layer and dead plant leaves and stems on the Suface of the soil
27. Chemical change when when a substance combines with oxygen
29. Anything in the environment that humans use

1. A soil organism that breaks down the remains of organisms and digests them
3. rocks broken down physically
6. Layer of soil beneath the topsoil, contains clay and other minerals
12. management of soil to prevent destruction
13. A map that shows Suface area
14. A material that is full of tiny connected air spaces that water can seep through
15. The process when water seeps into cracks, freezes and expands
16. Grinding away of rock by other rock particles carried in ice, water,or wind
17. plowing fields along curves of slopes to prevent soil loss
18. thick mass of grass roots and soil
20. When water, ice, wind, or gravity moves weathered rock or soil
24. The crumbly, topmost layer of soil, mixture of humus, clay, and other minerals
28. Dark colored organic material in soil