Across
- 4. The horizon of weathered rock or partially weathered soil material from which the soil is formed.
- 7. The arrangement of primary soil particles into compoundparticles or aggregates taht are separated from adjoining aggregates
- 9. Single-celled microorganisms; some cause human, animal, or plan t diseases; others are beneficial
- 10. A unit oif soil structuyre such as an aggregate, crumb, prism, block, or granule, formed by natural processes (in contrast with a clod, which is formed artificially by compression of a wet clay soil).
- 12. 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.
- 17. An organism so small that it cannot be seen clearly without the use of a microscope, a microscopic or submicroscopic organism
- 18. The relative degree of downward movement of water in a soil. Also called permeability.
- 21. Soil that consists of less than 52% sand, 28-50% silt, and 7-27% nclay, resulting in a soil texture ideal for gardening.
- 23. The relative proportion in a soil of the vaious size groups of individual soil grains
- 25. A layer of soil, approximately parallel to the surface, having distinct characteristics produced by soil-forming processes
- 27. The removal of soluble constituents from soils or other materials by percolating water.
Down
- 1. A size term denoting particles, regardless of mineral composition, withg a diameter less that two microns
- 2. Accumulation of water-worn pebbles larger than two millimeters in diameter
- 3. Microscopic, wormlike, transparent organisms that can attack plant roots or stems to cause stunted or unhealthy growth
- 5. Unweathered hard rock that lies directly beneath the soil layers or beneath superficial geological deposits, such as glacial drift
- 6. Matter found in or produced by, living animals and plants, which contains carbon, hydrogen, oxygen, and often nitrogen and sulfur
- 7. In soil science, a group of textural classes in which the particles are finer than gravel but coarser than silt, ranging in size from 2.00 to 0.5 millimeters in diameter. It is the textural class of any soil that contains 85% or more of sand and not more than 10% of clay.l
- 8. The artificial application of water to soil for the purpose of increasing plant production
- 11. 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. About half of soil volume which is in a good physical condition for plkant growth is pore space.
- 13. Any living individual, whether plant or animal
- 14. Plantlike organisms that have nbo chlorophyll; they get their nourishment from living or decaying organic matter
- 15. The mineral and organic surface of the earth capable of supporting upoland plants. It has been (abnd is being) formed by the active factors of climate and biosphere exerting their influence on passive plant material and topography over neutral time.
- 16. A vertical section of a soil. The section, or face of an exposure made by a cut, may exhibit with depth a succession of separate layers.
- 19. Any vegetation that grows close to the ground, producing protection for the soil
- 20. A textural class of soils containing 80% or more of silt and less than 12% clay.
- 22. A phylum or division of the animal kingdom; includes insects, spiders, and Crustacea; characterized by a coating which serves as an exoskeleton and by legs with distinct movable segments or joints.
- 24. Color difference on a mass of moderately poorly drained soil
- 26. Mineral matter of variable composition, consolidated or unconsolidated, assembled in masses or considerable quantities in nature.