By Michael Allaby
This prime dictionary - now in its fourth version - deals wide-ranging and authoritative insurance of the earth sciences and similar issues in over 7,500 transparent and obtainable entries. assurance 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 additional, with accelerated insurance of geology and planetary geology phrases. Over a hundred thirty line drawings accompany the definitions.
The Dictionary additionally presents suggested net hyperlinks that are indexed and often up-to-date on a devoted significant other 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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Additional info for A Dictionary of Geology and Earth Sciences
The brain case was long and low. The front teeth were peg-like, the cheek teeth *heterodont and characteristic of primitive carnivores. There were 44 teeth in all. The hind legs in most were reduced to vestiges, but in some early genera (*Ambulocetus, *Basilosaurus) still protruded from the body wall. They were ﬁsh-eating carnivores that had adopted an aquatic life to which they were more highly adapted than, for example, modern seals. The term archaeocete really means any primitive cetacean and probably does not designate a natural, *monophyletic group.
See basalt. andhis Local term, used in the north-west of the Indian subcontinent, for dust storms accompanying violent squalls, caused by strong convection. andic horizon A *soil horizon containing weathered *pyroclastic deposits. Andino-type margin See active margin. Andosols A reference soil group in the classiﬁcation used by the *FAO, comprising volcanic soils with a *vitric horizon at a depth of more than 30 cm or an *andic horizon within 25 cm of the surface. andradite Member of the *garnet group of *minerals, Ca3Fe2(SiO4)3; sp.
It is formally the product of the mass of the body, the radius of the orbit, and the square of the angular velocity (mro2). Because of its rotation about its axis, the Earth has rotational angular momentum, and orbital angular momentum on account of its annual revolution around the Sun. 45 Â 1034 rad/kg/m2/s) is the sum of the rotational angular momentum of the Earth and the Moon’s orbital angular momentum, and is high compared to that of the other terrestrial planets. angular shear strain A measure of the angular rotation from two mutually perpendicular reference axes following simple *shear.
A Dictionary of Geology and Earth Sciences by Michael Allaby