RFG 2018 Conference

GeoWord of the Day

The GeoWord of the Day is a free service of the American Geosciences Institute. All of the terms and definitions are from the Glossary of Geology, 5th Edition Revised.

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foreland [geog] . The land lying in front of or adjoining other land and physiographically related to it.

diaene (di'-aene). A sponge spicule with two rays of equal length and one of a different length, usually longer; a triaene with one ray reduced or absent.

Keuper (Keu'-per). A term used (esp. in Germany) to what is now approx. the Upper Triassic (above Muschelkalk, below Jurassic). Essentially a lithostratigraphic term.

cryosol . Soil formed in either mineral or organic materials having permafrost either within 1 m below the surface or, if the soil is strongly cryoturbated, within 2 m below the surface, and having a mean annual ground temperature below 0° C. Cryosols are divided into turbic cryosols developed on mineral soils and strongly cryoturbated; static cryosols developed on mineral soils but with little or no cryoturbation; and organic cryosols developed on organic (peat) materials (Canada Soil Survey Committee, 1978).

mottles . Spots or blotches of different color or shades of color interspersed with the dominant color. See also: mottled zone; soil color.

mid-ocean rift . Rift valley [oceanog] associated with the mid-ocean ridge.

geophysiography (ge''-o-phys''-i-og'-ra-phy). The synthesis of all knowledge available about the Earth; "the combination...of relevant parts of geophysics, geochemistry, geomorphology, and geoecology" (Strøm, 1966, p.8). Apparently a unique usage.

relative fugacity . The ratio of the fugacity in a given state to the fugacity in a defined standard state.

acequia (a-ce-qui'-a [ah-se-kee'-ah]). A Spanish word, of Arabic origin, for an irrigation ditch or canal.

osmosis (os-mo'-sis). The movement at unequal rates of a solvent through a semipermeable membrane, which usually separates the solvent and a solution, or a dilute solution and a more concentrated one, until the solutions on both sides of the membrane are equally strong. Cf: dialysis. See also: electro-osmosis.


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