By Michael Allaby

This major dictionary - now in its fourth version - deals wide-ranging and authoritative insurance of the earth sciences and comparable themes in over 7,500 transparent and available entries. insurance contains geology, planetary technological know-how, oceanography, palaeontology, mineralogy, and volcanology, in addition to climatology, geochemistry, and petrology.

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

The Dictionary additionally offers prompt net hyperlinks that are indexed and often up-to-date on a committed spouse 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 students of geography, geology, and earth sciences, and for these in in comparable disciplines.

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Compare inhomogeneity; isotropy. Fe)(CO3)2; sp. gr. 0; *trigonal; yellowishbrown, sometimes white, yellow, or grey; white *streak; *vitreous *lustre; *crystals can be rhombohedral, but ankerite also occurs *massive and granular; *cleavage rhombohedral, perfect {1011}, faint {0221}; occurs as a *gangue mineral with iron ores, and as fillings associated with coal seams, and in an environment similar to that of *dolomite. 25)(CO3)2). 5 km. It is named a Ankylosaurus a after the Austrian mineralogist M.

Radiation from outside, or from within the shield, is detected by this ring of Geiger tubes and can be discounted. Special counters have now been developed in which the anticoincidence counters are built into the same tube as the main counter, so that the same gas is used in the whole system. The wall of such a counter usually consists of a polystyrene foil covered on both sides with aluminium. This is then surrounded by a ring of wires forming the *anode for the anticoincidence circuit. Apatosaurus 31 anticyclogenesis Process whereby an *anticyclone or a ridge of high pressure is formed and developed.

A Silurian scorpion, Palaeophonus nuncius, was perhaps the first terrestrial animal. The first fossil spiders are known from the *Devonian. The class is extremely diverse, but except in the mites the body is in two portions: the prosoma (anterior portion) which bears the four pairs of legs, the eyes, the pedipalps (second pair of appendages), and the chelicerae (first pair of appendages, usually pincer-like); and the opisthosoma (posterior portion) which contains most of the internal organs and glands.

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