Soil science

1. Any herbaceous plant not a grass or a sedge.
3. The well decomposed, more or less stable part of the organic matter in mineral soils.
5. When dry, moderately resistant to pressure; can be broken with difficulty between thumb and forefinger.
8. When wet, readily deformed by moderate pressure but can be pressed into a lump; will form a ""wire'' when rolled between thumb and forefinger.
10. Waterlogged,spongy ground
13. High risk of corrosion to uncoated steel or deterioration of concrete.
14. A shallow depression from which all or most of the soil material has been removed by wind
16. Hard; little affected by moistening.
18. When wet, adheres to other material and tends to stretch somewhat and pull apart rather than to pull free from other material.
19. A compact, dense layer in a soil that impedes the movement of water and the growth of roots
20. When moist, crushes under moderate pressure between thumb and forefinger, but resistance is distinctly noticeable.

2. Rock fragments larger than 2 feet in diameter.
4. The wearing away of the land surface by water, wind, ice, or other geologic agents.
6. When moist, crushes easily under gentle pressure between thumb and forefinger and can be pressed together into a lump.
7. When dry, breaks into powder or individual grains under very slight pressure.
9. Fine grained material, dominantly of silt-sized particles, deposited by wind.
11. Water is applied at the upper end of a strip in which the lateral flow of water is controlled by small earth ridges called border dikes, or borders.
12. Noncoherent when dry or moist; does not hold together in a mass
15. The removal of soluble material from soil or other material by percolating water.
17. As a soil separate, the mineral soil particles less than 0.002 millimeter in diameter
18. Water is sprayed over the soil surface through pipes or nozzles from a pressure system.