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Erzgebirge

(Encyclopedia)Erzgebirge ĕrtsˈgəbĭrˌgə [key] [Ger.,=ore mountains], Czech Krušné Hory, mountain range, along the Czech–German border, extending c.95 mi (150 km) from the Fichtelgebirge in the southwest to...

Oak Ridge

(Encyclopedia)Oak Ridge, city (1990 pop. 27,310), Anderson and Roane counties, E Tenn., on Black Oak Ridge and the Clinch River; founded by the U.S. government 1942, inc. as an independent city 1959. For years Oak ...

Spokane, city, United States

(Encyclopedia)Spokane spōkănˈ [key], city (1990 pop. 177,196), seat of Spokane co., E Wash., at the spectacular falls of the Spokane River; inc. 1881. It is a port of entry and the commercial, transportation, an...

astatine

(Encyclopedia)astatine ăsˈtətēn, –tĭn [key] [Gr.,=unstable], semimetallic radioactive chemical element; symbol At; at. no. 85; at. wt. of most stable isotope 210; m.p. 302℃ (estimated); b.p. 337℃ (estima...

Wilkins, Maurice Hugh Frederick

(Encyclopedia)Wilkins, Maurice Hugh Frederick, 1916–2004, British biophysicist, b. New Zealand, Ph.D. Univ. of Birmingham, 1940. He conducted research at the Univ. of St. Andrews, Scotland, and at Kings College, ...

Agadez

(Encyclopedia)Agadez ägädĕsˈ [key], town, W central Niger, in the Aïr Massif. Agadez is a trade center visited by Tuareg pastoral nomads. Leather and silver handicrafts are ...

zirconium

(Encyclopedia)zirconium zərkōˈnēəm [key], metallic chemical element; symbol Zr; at. no. 40; at. wt. 91.224; m.p. about 1,852℃; b.p. 4,377℃; sp. gr. 6.5 at 20℃; valence +2, +3, or +4. Zirconium is a very ...

Narbonne

(Encyclopedia)Narbonne närbônˈ [key], city (1990 pop. 47,086), Aude dept., S France, near the Mediterranean coast. It is the commercial center of a wine-growing region and an industrial city producing sulfur, co...

North West

(Encyclopedia)North West, province (2011 pop. 3,509,953), 40,495 sq mi (104,882 sq km), N central South Africa. In 1994, under South Africa's post-apartheid constitution, North West was created from parts of the fo...

Black Hills

(Encyclopedia)Black Hills, rugged mountains, c.6,000 sq mi (15,540 sq km), enclosed by the Belle Fourche and Cheyenne rivers, SW S.Dak. and NE Wyo., and rising c.2,500 ft (760 m) above the surrounding Great Plains;...