Maps & earths soil

2. the layer beneath the topsoil that makes up clay and other minerals
5. dark colored organic material in soil
8. the process if either ice, water, wind or gravity moves rock or soil
10. anything in a envirorment humans use
12. when water seeps in a crack in a rock & freezes and expands
14. when rock breaks down by chemical changes
15. soil conservation, dead stalks hold the soil in place
18. the loose layer of dead plant leave & stems on the surface of the soil
19. the grinding away of rock by other rock particles carried in water or ice
21. a measure of how well soil supports plant growth
23. a mixture of humas, clay, that forms crumbly, topmost layer of soil
25. a topo map, a heavier contour line is labled with round units
27. the managment of soil to prevent its destruction
28. the solid layer of rock beneath the surface
29. a line on a topo map that connects points of equal elevation

1. loose, weathered material on earths surfuce in which plants can grow
2. they layer of soil that differs than the bottom or top soils
3. the geological prinsiple changes over time
4. a map that shows surface features of an area
6. bowl- the great plains, wind erosion of soil loss in the 1930's
7. the difference in elevation from one contour line to the next
9. the chemical & pysical processes that break down rock on earths surface
11. rich fertile soil that is made up of most equal parts of clay, sand, and silt
13. a type of weather that rock is broken down into smaller pieces
16. a chemical change, a stubstance combines with oxygen, then forms rust
17. a thick mass of grass roots and soil
20. plowing feilds along the curves of a slope so loss soil
22. a meterial full of tiny, connected air spaces water can seep through
24. planting new in a feild each year to maintain soils fertility
26. soil organasims that breaks down organisms & digest them