- 업종: 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 ...
One of a series of platforms in a stream valley, flanking and more or less parallel to the stream channel, originally formed near the level of the stream, and representing the dissected remnants of an abandoned flood plain, stream bed, or valley floor produced during a former state of erosion or deposition. Erosional surfaces cut into bedrock and thinly mantled with stream deposits (alluvium) are designated "strath terraces. " Remnants of constructional valley floors thickly mantled with alluvium are termed alluvial terraces.
Industry:Earth science
Process of erosion involving mass slumping of a stream or gully bank.
Industry:Earth science
Antonym of soil aggregation, referring to the act of breaking soil apart into fragments. Occurs mainly in response to drop shatter experiments, sieving, or tillage operations such as chisel plowing and disking.
Industry:Earth science
A zonal great soil group consisting of soils with a very dark brown or black A1 (A) horizon underlain by a dark gray, weakly expressed A2 (E) horizon and a brown B (?) horizon; formed in the forest-prairie transition of cool climates.
Industry:Earth science
Determination of the various amounts of the different soil separates in a soil sample, usually by sedimentation, sieving, micrometry, or combinations of these methods.
Industry:Earth science
A thin, dark, shiny film or coating of iron oxide and lesser amounts of manganese oxide and silica formed on the surfaces of pebbles, boulders, rock fragments, and rock outcrops in arid regions.
Industry:Earth science
A tangible object or mathematical function made up of parts similar to the whole in some way, such that any small part of it , enlarged has the same statistical character as the original. Fractals are often employed in soil science to model soil aggregation, pore networks and soil fragmentation:
* fractal dimention-A measure of the dimensionality of a fractal object or function. Its value is generally a fractional number that is either less or greater than the Euclidean dimension of the space in which the fractal is embedded.
* fragmentation- The act of breaking apart a tangible object or mathematical function into pieces or fragments
* monofractals-Fractals that can be characterized by a single fractal dimension.
* multifractal-A type of fractal, usually associated with multplicative cascades, that is characterized by a spectrum of generalized or R<é>nyii dimensions instead of a single fractal dimenion. Used to scale soil spatial and temporal variablility.
Industry:Earth science
