4.2 Vocabulary

2. The process of being supplied with air
4. A substance in soil, such as organic matter, or clay, which resists change of soil pH.
5. The first change with depth in texture or structure in a soil profile
6. A vertical section of soil. The section, or face of an exposure made by a cut, may exhibit a succession of separate layers with depth, although these may not be separated by sharp lines of demarcation
8. The ability of a soil to resist a change in its hydrogen-ion concentration.
12. Surface or subsurface soils presumably are fertile soils, rich in organic matter r humus debris
14. The ability of soil to hold water in the root zone.
16. A thin mixture of water and any fine insoluble materials such as clay
17. Able to burn or corrode organic tissue by chemical action
18. A unit of soil structure, such as an aggregate, crumb, prism, block, or granule, formed by natural processes
19. The relative portions of sand, silt, and clay particles in a mass of soil

1. The relative degree of downward movement of water in soil; also called permeability
3. The capacity of soil or rock for transmitting a fluid. The degree of permeability depends upon the size and shape of the pores, the size and shape of their interconnections, and the extent of the latter
7. Refers to the extent of voids or openings in the soil that exist between soil particles and soil peds or clods. These pores hold water and air for absorption by plant roots.
9. The act or process of separating a solid from a liquid
10. Soil that consists of less than 52 percent sand, 28 to 50 percent silt, and 7 to 27 percent clay,
11. The arrangement of primary soil particles into compound particles or aggregates separated from adjoining aggregates.
13. A soil separate in the mechanical analysis of soil.
15. A layer of soil, approximately parallel to the surface, having distinct characteristics produced by soilforming processes.