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Sterling
(Encyclopedia) Sterling. 1 City (1990 pop. 10,362), seat of Logan co., NE Colo., on the South Platte River; inc. 1884. It is the trading and shipping center of an agricultural area (grain, cattle,…Janesville
(Encyclopedia) Janesville, city (1990 pop. 52,133), seat of Rock co., S central Wis., on the Rock River; inc. 1853. It is an industrial and commercial center in a grain, dairy farm, and tobacco area…rhyolite
(Encyclopedia) rhyolite, fine-grained light-colored acidic volcanic rock. Rhyolite is chemically the equivalent of granite, and is thus composed primarily of quartz and orthoclase feldspar with…silt
(Encyclopedia) silt, predominantly quartz mineral particles that are between sand size and clay size, i.e., between 1&fslsh;16 and 1&fslsh;256 mm (1&fslsh;406 –1&fslsh;6502 in.) in…Baltic Shield
(Encyclopedia) Baltic Shield, the continental core of Europe, composed of Precambrian crystalline rock, the oldest of Europe. The tectonically stable region was not affected by the Caledonian,…Great Artesian Basin
(Encyclopedia) Great Artesian Basin, c.670,000 sq mi (1,735,300 sq km), between the Eastern Highlands and the Western Plateau, E central Australia, extending S from the Gulf of Carpentaria,…syenite
(Encyclopedia) syenitesyenitesīˈənīt [key], coarse-grained igneous rock, similar in appearance and composition to granite. Unlike granite, it contains little or no quartz. The chief minerals in…Who, The
(Encyclopedia) Who, The, English rock music group formed in 1964. The members were Peter Dennis Blanford Townshend, 1945–, Chiswick, London, U.K…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…sandstone
(Encyclopedia) sandstone, sedimentary rock formed by the cementing together of grains of sand. The usual cementing material in sandstone is calcium carbonate, iron oxides, or silica, and the hardness…Trending
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