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rock
(Encyclopedia) rock, aggregation of solid matter composed of one or more of the minerals forming the earth's crust. The scientific study of rocks is called petrology. Rocks are commonly divided,…joint, in geology
(Encyclopedia) joint, in geology, fracture in rocks along which no appreciable movement has occurred (see fault). Nearly vertical, or sheet, joints that result from shrinkage during cooling are…schist
(Encyclopedia) schistschistshĭst [key], metamorphic rock having a foliated, or plated, structure called schistosity in which the component flaky minerals are visible to the naked eye. Schists are…McKees Rocks
(Encyclopedia) McKees Rocks, borough (1990 pop. 7,691), Allegheny co., SW Pa., an industrial suburb of Pittsburgh, on the Ohio River; settled c.1764, inc. 1892. Manufacturing includes metal and food…metamorphic rocks
(Encyclopedia) metamorphic rocks: see rock.Liancourt Rocks
(Encyclopedia) Liancourt Rocks, Jap. Takeshima, Korean Dokdo or Tokdo, island group, 58 acres (23 hectares), in the SW Sea of Japan, roughly midway between the Japanese island of Honshu and the…petrology
(Encyclopedia) petrology, branch of geology specifically concerned with the origin, composition, structure, and properties of rocks, primarily igneous and metamorphic, and secondarily sedimentary. It…metamorphism
(Encyclopedia) metamorphism, in geology, process of change in the structure, texture, or composition of rocks caused by agents of heat, deforming pressure, shearing stress, hot, chemically active…Transantarctic Mountains
(Encyclopedia) Transantarctic Mountains, mountain chain stretching across Antarctica from Victoria Land to Coats Land; separating the E Antarctic and W Antarctic subcontinents. Mt. Markham (14,275 ft…paleomagnetism
(Encyclopedia) paleomagnetism, study of the intensity and orientation of the earth's magnetic field as preserved in the magnetic orientation of certain minerals found in rocks formed throughout…Trending
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