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Steep Rock Lake

(Encyclopedia)Steep Rock Lake, 4 mi (6.4 km) long and 3 mi (4.8 km) wide, SW Ont., Canada, W of Lac des Mille Lacs. It is the site of important iron ore mining. Part of the lake was drained to facilitate the mining...

Dome of the Rock

(Encyclopedia)Dome of the Rock: see Islamic art and architecture. ...

Chimney Rock National Monument

(Encyclopedia)Chimney Rock National Monument, 4,726 acres (1,913 hectares), SW Colorado; est. 2012. Located in San Juan National Forest, it is bordered by the Southern Ute reservation. Within the monument are the r...

cock-of-the-rock

(Encyclopedia)cock-of-the-rock: see cotinga.

rock carvings and paintings

(Encyclopedia)rock carvings and paintings, designs inscribed on rock surfaces and huge stone monuments in many parts of the world by prehistoric or preindustrial peoples. They have been found on every continent and...

Rock Island, town, Canada

(Encyclopedia)Rock Island, town (1991 pop. 1,067), S Que., Canada, at the Vermont border. It is the seat of Stanstead College. Machine tools, dies, and textiles are made. ...

Rock Island, city, United States

(Encyclopedia)Rock Island, city (1990 pop. 40,552), seat of Rock Island co., NW Ill., on the Mississippi and Rock rivers, adjacent to Moline and opposite Davenport, Iowa; inc. 1841. These three cities, with Bettend...

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 fluids, or a combin...

granite

(Encyclopedia)granite, coarse-grained igneous rock of even texture and light color, composed chiefly of quartz and feldspars. It usually contains small quantities of mica or hornblende, and minor accessory minerals...

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 includes petrog...