By Michael Allaby
This best dictionary - now in its fourth variation - bargains wide-ranging and authoritative insurance of the earth sciences and similar issues in over 7,500 transparent and available 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 increased assurance of geology and planetary geology phrases. Over a hundred thirty line drawings accompany the definitions.
The Dictionary additionally presents advised net hyperlinks that are indexed and frequently up-to-date on a committed spouse 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 vital 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
Commission on Stratigraphy, 2004). 2. The Anisograptidae See graptoloidea. anisomyarian See muscle scar. anisotropic 1. Applied to substances whose optical or other physical properties vary according to the direction from which they are observed. In optical mineralogy the term is applied to *minerals other than *cubic that split the light passing through them into two *vibration directions, each with a different velocity (provided the light is not travelling along an *optic axis), as a result of the light being doubly refracted (see double refraction).
A A NASA programme of missions from 1963 to 1972 to land humans on the Moon and return them to Earth. apomorph Evolutionarily advanced (‘derived’) character state. The long neck of the giraffe is apomorphic; the short neck of its ancestor is *plesiomorphic. apomorphic Applied to features possessed by a group of biological organisms that distinguish those organisms from others descended from the same ancestor. The term means ‘newfeatured’ and refers to ‘derived’ characters that have appeared during the course of evolution.
Gastropods may be subdivided according to their respiratory structures; archaeogastropods, the most primitive gastropods, possess just two gills. Some forms possess a marginal slit near the *aperture to facilitate the removal of exhaled water and wastes. This may extend posteriorly for some distance but eventually it is ﬁlled with shell material as the animal grows and extends its shell. The ﬁlled slit (selenizone) is usually completely plugged. g. Haliotis) the selenizone is represented by a linearly arranged series of apertures (tremata, sing.
A Dictionary of Geology and Earth Sciences by Michael Allaby