- 行业: Earth science
- Number of terms: 26251
- Number of blossaries: 0
- Company Profile:
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 mineral containing a circular arrangement of silica tetrahedra which share two oxygens per tetrahedra; silicon-oxygen ration is SiO,32-; example: beryl, Be3Al2(SiO3)6; cyclosilicate.
Industry:Earth science
A relatively thin, flat rock fragment, from 150 to 380 mm on the long axis.
Industry:Earth science
A prescribed condition imposed upon the boundary of the flow domain.
Industry:Earth science
A lack of interaction between two organisms in the same ecosystem.
Industry:Earth science
A drainage class referring to soils which have evidence (e.g., mottles) of seasonal water tables at depths between 0 and 8 inches.
Industry:Earth science
(i) The absence of molecular oxygen. (ii) Growing in the absence of molecular oxygen (such as anaerobic bacteria). (iii) Occurring in the absence of molecular oxygen (as a biochemical process).
Industry:Earth science
A dioctahedral smectite with the majority of the charge originating in the tetrahedral layer.
Industry:Earth science
A dense, compact, slowly permeable layer in the subsoil having a much higher clay content than the overlying material, from which it is separated by a sharply defined boundary. Claypans are usually hard when dry, and plastic and sticky when wet.
Industry:Earth science
A solid surface carrying a net electrical charge which may be positive, negative, or zero, depending on the activity of one or more species of a potential-determining ions in the solution phase contacting the surface. For minerals and other materials common in soils(e.g. soil organic matter, and oxides), the potential-determining ion usually is H+ or OH-, but any ion that forms a complex with the surface may be potential-determining.
Industry:Earth science
A sediment body, rock layer, or soil horizon that is incapable of transmitting significant quantities of water under ordinary hydraulic gradients.
Industry:Earth science
