- 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 flood-plain landform. Extensive, marshy, or swampy, depressed areas of flood plains between natural levees and valley sides or terraces.
Industry:Earth science
A low dam or overflow structure specified geometry placed across an open channel to measure the discharge from a unique water level-discharge relationship called the rating curve.
Industry:Earth science
(i) A soil separate consisting of particles <0. 002 mm in equivalent diameter. See also soil separates. (ii) A textural class. See also soil texture. (iii) (In reference to clay mineralogy) A naturally occurring material composed primarily of fine-grained minerals, which is generally plastic at appropriate water contents and will harden when dried or fired. Although clay usually contains phyllosilicates, it may contain other materials that impart plasticity and harden when dried or fired. Associated phases in clay may include materials that do not impart plasticity and organic matter.
Industry:Earth science
A particular mixture of soil and water. At saturation, the soil paste glistens as it reflects light, flows slightly when the container is tipped, and the paste slides freely and cleanly from a spatula.
Industry:Earth science
A gently sloping, erosional surface developed at the foot of a receding hill or mountain slope. The surface can be bare or it may be thinly mantled with alluvium and colluvium in transport to the adjacent valley.
Industry:Earth science
A layer of partially decomposed litter with portions of plant structures still recognizable (hemic material). Occurs below the L layer on the forest floor in forest soils. It is the fermentation layer.
Industry:Earth science
(i) Having molecular oxygen as a part of the environment. (ii) Growing only in the presence of molecular oxygen, such as aerobic organisms. (iii) Occurring only in the presence of molecular oxygen (said of chemical or biochemical processes such as aerobic decomposition).
Industry:Earth science
A measure of the ability of the soil to support tractors and other vehicles.
Industry:Earth science
A closed depression formed either by solution of the surficial bedrock (e.g., limestone, gypsum, or salt) or by collapse of underlying caves. Complexes of sinkholes in carbonate-rock terrain are the main components of karst topography.
Industry:Earth science
