Download A Dictionary of Geology and Earth Sciences by Michael Allaby PDF

By Michael Allaby

This top dictionary - now in its fourth version - bargains wide-ranging and authoritative assurance of the earth sciences and similar subject matters in over 7,500 transparent and available entries. insurance comprises geology, planetary technology, oceanography, palaeontology, mineralogy, and volcanology, in addition to climatology, geochemistry, and petrology.

This re-creation has been totally up to date with a hundred and fifty new entries extra, with extended insurance of geology and planetary geology phrases. Over one hundred thirty line drawings accompany the definitions.

The Dictionary additionally offers urged net hyperlinks that are indexed and frequently up to date on a devoted 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 key for college kids of geography, geology, and earth sciences, and for these in in similar disciplines.

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Extra resources for A Dictionary of Geology and Earth Sciences

Sample text

2. Of a wave, the distance between the highest point of the wave and the position of zero displacement. ampulla An inflatable sac at the end of each *tube-foot in the echinoids (*Echinoidea). It controls water pressure in the tube-foot when the muscles in its walls are contracted. amygdale (amygdule; adj. g. *calcite, *quartz, or *zeolites. 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.

Angular unconformity A *discordant surface of contact between the deposits of two episodes of sedimentation in which the older, underlying *strata have undergone folding, uplift, and *erosion before the deposition of the younger *sediments, so that the younger strata truncate the older. See also unconformity. angular velocity (Ω) The speed of a body that is moving along a curved path, usually expressed in radians per second; Ω = 2p/T, where T is the time taken to complete one revolution. anhedral (allotriomorphic) A morphological term referring to grains in *igneous rocks which have no regular crystalline shape.

The feldspars frequently occur as strongly zoned *phenocrysts. Glassy andesites are rare. An increase in the *quartz percentage marks the gradation of andesites into *dacites. g. mugearite and hawaiite) exhibit basaltic features, including a higher *olivine content. 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.

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