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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miarolithite (mi''-a-ro-lith'-ite). A chorismite having miarolitic cavities or remnants thereof; a variety of ophthalmite [meta]. Rarely used.

hair pyrites . (a) millerite. (b) Capillary pyrite.

body wave . A seismic wave that travels through the interior of the Earth, with a propagation mode that does not depend on any boundary surface. A body wave may be either longitudinal (a P wave ) or transverse (an S wave ).

tension (ten'-sion). A state of stress in which tensile stresses predominate; stress that tends to pull a body apart.

muck [mining] . n. Rock or ore broken in mining v. To remove broken rock or ore.

wind ripple [snow] . One of a series of centimeter-scale, wavelike formations on a snow surface, lying at right angles to the wind direction, and formed as snow grains are moved along by the wind.

velar structure . Any elongate elevated structure parallel to the free edge of the valve in straight-backed ostracodes, commonly developed as a frill (velum) or a velar ridge; if a carina is present, the velar structure lies ventral to it.

sweeping (sweep'-ing). The progressive down-valley movement or shift of a system of meanders. See also: wandering. Also called: sweep.

pedestal [geomorph] (ped'-es-tal). A relatively slender neck or column of rock capped by a wider mass of rock and produced by undercutting as a result of wind abrasion (as in the SW U.S.) or by differential weathering. See also: pedestal rock. Syn: rock pedestal.

residual acidity . Soil acidity that is neutralized by lime or a buffered salt solution to raise the pH to a specified value (usually 7.0 or 8.0) but which cannot be replaced by an unbuffered salt solution. It can be calculated by subtraction of salt replaceable acidity from total acidity. See also: salt replaceable acidity; total acidity.


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