By Michael Allaby
This best dictionary - now in its fourth version - bargains wide-ranging and authoritative insurance of the earth sciences and similar themes in over 7,500 transparent and obtainable entries. assurance comprises geology, planetary technology, oceanography, palaeontology, mineralogy, and volcanology, in addition to climatology, geochemistry, and petrology.
This re-creation has been absolutely up to date with a hundred and fifty new entries further, with improved assurance of geology and planetary geology phrases. Over a hundred thirty line drawings accompany the definitions.
The Dictionary additionally presents suggested internet hyperlinks that are indexed and frequently up to date on a devoted better half web site. Appendices contain 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 students of geography, geology, and earth sciences, and for these in in comparable disciplines.
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Extra info for A Dictionary of Geology and Earth Sciences
Amphibians See amphibia. e. parallel to the *prism zone of a crystal. The double chains are held together by monovalent, divalent, or trivalent cations, of which Na+, Ca2+, Mg2+, Fe2+, Al3+, and Fe3+ are the most important; hydroxyl ions also occur. , and Z = Si or Al. Calcium-poor amphiboles include the *orthorhombic amphiboles (called the orthoamphiboles) and include *anthophyllite and gedrite, but the other two groups are *monoclinic and include the common *hornblendes *tremolite and *actinolite, as well as the sodium-rich varieties such as *glaucophane and *riebeckite.
Aquifer test See pumping test. APXS See alpha–proton–x-ray spectrometer. aquifuge See aquiclude. aquamarine See beryl. Aquitanian 1. 03 Ma ago) in the *Miocene Epoch, preceded by the *Chattian (*Oligocene), followed by the *Burdigalian (Int. Commission on Stratigraphy, 2004). 2. The name of the corresponding European *stage, which is roughly contemporaneous with the upper *Zemorrian and lower *Saucesian (N. America), parts of the *Otaian (New Zealand), and the upper *Janjukian and lower *Longfordian (Australia).
Amygdaloidal See amygdale. amygdule See amygdale. An See alkali feldspar. anabatic wind A wind that blows up a slope, often gently, and usually when the sloping ground surface has been warmed by the Sun. Compare katabatic wind. anabranching channel A type of *distributary river channel that separates from its trunk stream and may ﬂow parallel to it for several kilometres before rejoining it. The anabranching channel remains undivided, and so differs from an anastomosing channel which has major distributaries that branch and then rejoin it.