G chapter 2

2. type of soil that is made up of about equal parts of clay, sand, and silt
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
9. Planting of different crops in fields each year to maintain soils fertility
10. A map that shows Suface area
12. measure of how well soil supports plant growth
13. plowing fields along curves of slopes to prevent soil loss
14. A soil organism that breaks down the remains of organisms and digests them
15. A material that is full of tiny connected air spaces that water can seep through
16. Loose layer and dead plant leaves and stems on the Suface of the soil
17. Chemical change when when a substance combines with oxygen
18. The distance in elevation from Contour line to Contour line
19. Darker contour line on a topographic map that rounds elevation units
21. rocks broken down physically
25. Layer of soil beneath the topsoil, contains clay and other minerals
26. The process when water seeps into cracks, freezes and expands
29. Solid layer of rock beneath the soil

1. Rocks that break down on Earths Suface physically and chemically
3. Method which dead stalks from the previous years crops are left in the ground to hold soil in place
4. rocks broken down chemically
6. management of soil to prevent destruction
8. thick mass of grass roots and soil
11. Grinding away of rock by other rock particles carried in ice, water,or wind
20. The crumbly, topmost layer of soil, mixture of humus, clay, and other minerals
22. When water, ice, wind, or gravity moves weathered rock or soil
23. Dark colored organic material in soil
24. Anything in the environment that humans use
27. area of the Great Plains where wind erosion caused soil loss in the 1930s
28. Horizon Layer of soil that differs in color and texture