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basalt

(Encyclopedia) basaltbasaltbəsôltˈ, băsˈôlt [key], fine-grained rock of volcanic origin, dark gray, dark green, brown, reddish, or black in color. Basalt is an igneous rock, i.e., one that has…

Lorelei

(Encyclopedia) LoreleiLoreleilôrˈəlī, Ger. lōˈrəlī [key], cliff, 433 ft (132 m) high, on the right bank of the Rhine River, near St. Goarshausen, W Germany, about midway between Koblenz and Bingen.…

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,…