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Earth science
Any of several geological sciences that are concerned with the earth, its origins, and all of its various structures and physical forms and phenomena.
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Earth science > Soil science 
alpine meadow soils
Earth science; Soil science
A great soil group of the intrazonal order, comprised of dark soils of grassy meadows at altitudes above the timberline.
moderately well drained
Earth science; Soil science
A drainage class referring to soils which have evidence (e.g., mottles) of seasonal water tables at depths between 18 and 36 inches.
illuvial horizon
Earth science; Soil science
A soil layer or horizon in which material carried from an overlying layer has been precipitated from solution or deposited from suspension. The layer of accumulation.
pure culture
Earth science; Soil science
A population of microorganisms composed of a single strain. Such cultures are obtained through selective laboratory procedures and are rarely found in a natural environment.
diazotroph
Earth science; Soil science
A microorganism or association of microorganisms that can reduce molecular nitrogen (N2) to ammonia.
microcosm
Earth science; Soil science
A community or other unit that is representative of a larger unit.
microbial biomass
Earth science; Soil science
(i) The total mass of living microorganisms in a given volume or mass of soil. (ii) The total weight of all microorganisms in a particular environment.
Sub-categories
- Geology (10953)
- Mapping science (105290)
- Oceanography (12332)
- Physical oceanography (42660)
- Remote sensing (8661)
- Seismology (14406)
- Soil science (29216)