Read e-book online A Dictionary of Geology and Earth Sciences PDF

By Michael Allaby

ISBN-10: 0199653062

ISBN-13: 9780199653065

This major dictionary - now in its fourth variation - deals wide-ranging and authoritative assurance of the earth sciences and comparable issues in over 7,500 transparent and available entries. insurance comprises geology, planetary technology, oceanography, palaeontology, mineralogy, and volcanology, in addition to climatology, geochemistry, and petrology.

This new version has been totally up to date with one hundred fifty new entries extra, with accelerated assurance of geology and planetary geology phrases. Over a hundred thirty line drawings accompany the definitions.

The Dictionary additionally presents steered internet hyperlinks that are indexed and frequently up to date on a devoted better half web site. Appendices comprise a revised geological time scale, an up-to-date bibliography, stratigraphic devices, lunar and Martian time scales, wind-strength scales, and SI devices. This dictionary is key for college kids of geography, geology, and earth sciences, and for these in in similar disciplines.

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These rocks occur most frequently in *Precambrian *shield areas as non-stratiform intrusions or in layered complexes. Anorthosite also constitutes the *lunar highlands where it is largely composed of the calcium *end-member anorthite. anoxic The condition of oxygen deficiency or absence of oxygen. Anoxic *sediments and anoxic bottom waters are commonly produced where there is a deficiency of oxygen due to very high organic productivity and a lack of oxygen replenishment to the water or sediment, as in the case of stagnation or stratification of the water body.

Aquarius An instrument built and owned by NASA that was launched on 10 June 2011 on a Delta II vehicle, carried on the Argentine Satelite de Aplicaciones Cientificas-D (SAC-D) of the Comisión Nacional de Actividades Espaciales aquitard A *rock with low values of *hydraulic conductivity, which allows some movement of water through it, but at rates of flow lower than those of adjacent *aquifers. Compare aquiclude. Aqua A NASA satellite, launched on 4 May 2002, that carries six Earth-observing instruments to measure almost all aspects of the *hydrologic cycle, as well as radiative energy fluxes, *aerosols, terrestrial vegetation cover, marine phytoplankton and dissolved organic matter, and air, land, and water temperatures.

Anticyclolysis Process whereby an *anticyclone or ridge of high pressure is dissipated or weakened. anticyclone Area or system of high atmospheric pressure that has a characteristic pattern of air circulation, with subsiding air and horizontal divergence of the air near the surface in its central region. Winds are generally light because of small pressure gradients; they flow clockwise in the northern hemisphere and anticlockwise in the southern hemisphere. A *temperature inversion is common at the base of the air subsidence, and this restricts the vertical development of cloud.

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A Dictionary of Geology and Earth Sciences by Michael Allaby

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