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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…

Rock Creek Park

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

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…

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,…

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…

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…

Cashel

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

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…

well

(Encyclopedia) well, aperture in the earth's surface through which substances in a natural underground reservoir, such as water, gas, oil, salt, and sulfur, can flow or be pumped to the surface. In…