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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…

Prince

(Encyclopedia) Prince, 1958–2016, American singer and songwriter, b. Minneapolis, Minn., as Prince Rogers Nelson. Biracial, slim, and sexily androgynous, he was an electrifying performer who composed…

Blades, Rubén

(Encyclopedia) Blades, RubénBlades, Rubénr&oomacr;bānˈ bläˈᵺās [key], 1948–, Panamanian singer, songwriter, band leader, and actor. He is a graduate (1972) of the Univ. of Panama law school and…

aureole, in physics

(Encyclopedia) aureoleaureoleôrˈēōlˌ [key], in physics, luminous circle seen when the sun or other bright light is observed through a diffuse medium, i.e., smoke, thin cloud, fog, haze, or mist. It…

Arches National Park

(Encyclopedia) Arches National Park, 76,519 acres (30,979 hectares), E Utah; est. as a national monument 1929, designated a national park 1971. Located in red-rock country and overlooking the gorge…

Pontics

(Encyclopedia) Pontics, mountain system, N Turkey, extending c.700 mi (1,100 km) along the southern coast of the Black Sea. The Pontics generally increase in height from west to east, culminating in…

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…