By Michael Allaby
This dictionary of earth sciences has been revised and up to date and comprises over 6000 entries, together with planetary technological know-how, distant sensing, information, and series stratigraphy, and mammoth updating in paleontology, mineralogy, and geophysics.
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Extra resources for A Dictionary of Earth Sciences
E. an anaerobe. 3. Of a process: one that can occur only in the absence of oxygen. anafront Front (warm or cold) at which there is upward movement of the warmsector air, commonly producing clouds and precipitation. Compare katafront. anagenesis In the original sense, refers to evolutionary advance. Now it is often applied more widely, to virtually all sorts of evolutionary change, along a single, unbranching lineage. anatexis 23 analcime (analcite) *Mineral, Na(AlSi2O6) H2O; sp. gr. g. *nepheline syenites), and also volcanic *tuffs.
Anthrosols have *soil horizons that have been strongly affected by human activity (see hortic horizon; irragic horizon; and terric horizon). anti- From the Greek anti, meaning ‘against’, a preﬁx meaning ‘against’ (in the sense of opposed to), ‘opposite’, or ‘preventing’. Antian The Lower *Pleistocene, temperate, marine deposits that form the upper section of a tripartite division of deposits revealed in a *borehole at Ludham, in eastern England. See also baventian; ludhamian; pastonian; and thurnian.
Apparent polar wander (APW) The line traced on each of the continents by joining together the positions of the *palaeomagnetic poles at different times. The geometry of the line differs for each continent and appears to suggest a path followed by poles that changed their positions over time. In fact, the changing positions of the poles reﬂect the latitudinal movements and rotations of lithospheric *plates, rather than movements of the poles. apparent resistivity (ra) A measurement of resistivity which is calculated as the product of the measured resistance (R) and a *geomagnetic factor (Kg) such that ρa ϭ KgR, in units of ohms/m.
A Dictionary of Earth Sciences by Michael Allaby