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chain reaction

(Encyclopedia)CE5 Chain reaction: A neutron (n) strikes the uranium nucleus (U-235), causing it to split into fission products A and B and release two neutrons. These neutrons can in turn cause further fissions....

Shatt al Arab

(Encyclopedia)Shatt al Arab shät äl äˈräb [key], tidal river, 120 mi (193 km) long, formed by the confluence of the Tigris and Euphrates rivers, flowing SE to the Persian Gulf, forming part of the Iraq-Iran bo...

Liaobei

(Encyclopedia)Liaobei or Liaopei both: lēouˈbāˈ [key], former province (c.47,000 sq mi/121,700 sq km), NE China. The capital was Liaoyuan. It was one of nine provinces created in Manchuria in 1945 by the Chines...

Kanawha

(Encyclopedia)Kanawha kənôˈwə [key], principal river of W.Va., 97 mi (156 km) long, formed by the confluence of the New and Gauley rivers, S central W.Va., and flowing NW to the Ohio River at Point Pleasant; Ch...

Moscow, city, United States

(Encyclopedia)Moscow mŏsˈkō [key], city (1990 pop. 18,519), seat of Latah co., NW Idaho, at the Wash. line; inc. 1887. It is a trade center for a lumber and farm area where wheat, peas, lentils, and dairy items ...

Mukalla

(Encyclopedia)Mukalla məkäˈlə, mo͞okălˈə [key], town (1994 pop. 94,051), S Yemen, a port on the Gulf of Aden. It is the chief settlement of the Hadhramaut and the capital of the former sultanate of Qaiti. F...

Fleming, Peggy

(Encyclopedia)Fleming, Peggy, 1948–, American ice skater, b. San Jose, Calif. She began skating at age 9, and after distinguished accomplishments as a juvenile and novice skater, she was U.S. Ladies Champion from...

Fort William Henry

(Encyclopedia)Fort William Henry, at the southern end of Lake George, NE N.Y.; built by the English in 1755. In 1757, during the last conflict of the French and Indian Wars, it was captured and destroyed by the Fre...

Ilemi Triangle

(Encyclopedia)Ilemi Triangle, triangular-shaped region, c.10,000 sq km (3,860 sq mi) in area, at the NW corner of Lake Turkana, E Africa. It borders South Sudan (W), Ethiopia (E) and Kenya (S). A disputed territory...

intrauterine device

(Encyclopedia)intrauterine device (IUD), variously shaped birth control device, usually of plastic, which is inserted into the uterus by a physician. The IUD may contain copper or levonorgestrel, a progestin (a hor...