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Tiruchirapalli

(Encyclopedia) TiruchirapalliTiruchirapallitĭrˌ&oobreve;chĭrəpŭlˈlē [key], formerly TrichinopolyTiruchirapallitrĭchĭnŏˈpəlē [key], city (1991 pop. 711,862), Tamil Nadu state, SE India, on the…

Pennebaker, D. A.

(Encyclopedia) Pennebaker, D. A. (Donn Alan Pennebaker), 1925–2019, pioneering documentary filmmaker, b. Evanston, Ill. His first film, Daybreak Express (1958), is a five-minute short detailing New…

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…

Rock Creek Park

(Encyclopedia) Rock Creek Park: see National Parks and Monuments (table)national parks and monuments (table).

concretion

(Encyclopedia) concretion, mass or nodule of mineral matter, usually oval or nearly spherical in shape, and occurring in sedimentary rock. It is formed by the accumulation of mineral matter in the…

Cashel

(Encyclopedia) Cashel Cashel kăˈshəl [key] [Irish,=castle], town, Co. Tipperary, S central Republic of…

talus

(Encyclopedia) talustalustāˈləs [key], deposit of rock fragments detached from cliffs or mountain slopes by weathering and piled up at their bases. A talus is a common geologic feature in regions of…

quartzite

(Encyclopedia) quartzite, usually metamorphic rock composed of firmly cemented quartz grains. Most often it is white, light gray, yellowish, or light brown, but is sometimes colored blue, green,…

spring, in geology

(Encyclopedia) spring, in geology, natural flow of water from the ground or from rocks, representing an outlet for the water that has accumulated in permeable rock strata underground. Some of the…

Bowie, David

(Encyclopedia) Bowie, David, 1947–2016, British rock-and-roll singer and songwriter who successfully, merged rock, art, and fashion, b. London as David Robert Jones. After singing with five different…