- 行业: Earth science
- Number of terms: 26251
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An international scientific society that fosters the transfer of knowledge and practices to sustain global soils. Based in Madison, WI, and founded in 1936, SSSA is the professional home for 6,000+ members dedicated to advancing the field of soil science. It provides information about soils in ...
A poorly crystalline aluminosilicate mineral with an ideal composition SiO2 Al2O3 2. 5H2( + ). It appears as threads consisting of assemblies of a tube unit with inner and outer diameters of 1. 0 and 2. 0 nm, respectively. Imogolite is commonly found in association with allophane, and is similar to allophane in chemical properties. Imogolite is mostly found in soils derived from volcanic ash, and in weathered pumices and Spodosols.
Industry:Earth science
A compact, coherent mass of soil varying in size, usually produced by plowing, digging, etc. , especially when these operations are performed on soils that are either too wet or too dry and usually formed by compression, or breaking off from a larger unit, as opposed to a building-up action as in aggregation.
Industry:Earth science
A solidified body of rock formed from the lateral, surficial outpouring of molten lava from a vent or fissure, often lobate in form.
Industry:Earth science
(i) A generic term for ridge-like accumulations of sand , gravel, or other unconsolidated material formed in the channel, along the banks, or at the mouth of a streams or formed by waves or currents as offshore features in large lakes or oceans. (ii) A unit of pressure equal to one million dynes per square centimeter. Megapasal is the preferred unit for pressure in SSSA publications.
Industry:Earth science
(i) Geologic - The smallest, formal lithostratigraphic unit of sedimentary rocks. The designation of a bed or a unit of beds as a formally named lithostratigraphic unit generally should be limited to certain distinctive beds whose recognition is particularly useful. Coal beds, oil sands, and other layers of economic importance commonly are named, but such units and their names usually are not a part of formal stratigraphic nomenclature. (ii) Agronomic - A raised (usually) cultivated area between furrows or wheel tracks of tractors specially prepared, managed and/or irrigated to promote the production of a planted crop.
Industry:Earth science
A continual, annual, or periodic yield of plants or plant material from an area; implies management practices which will maintain the productive capacity of the land, be economically feasible, and maintain environmental integrity of the ecosystem.
Industry:Earth science
A mineral soil horizon from which clay and free iron oxides have been removed or in which the oxides have been segregated to the extent that the color of the horizon is determined primarily by the color of the primary sand and silt particles rather than by coatings on these particles.
Industry:Earth science
(i)Prokaryotes with cell walls that lack murein, having ether bonds in their membrane phospholipids, that are characterized by growth in extreme environments. (ii) A primary biological kingdom distinct from both eubacteria and eukaryotes.
Industry:Earth science
