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Central Valley

(Encyclopedia)Central Valley, great trough of central Calif., c.450 mi (720 km) long and c.50 mi (80 km) wide, between the Sierra Nevada and the Coast Ranges. The Sacramento and San Joaquin rivers drain much of the...

rift valley

(Encyclopedia)rift valley, elongated depression, trough, or graben in the earth's crust, bounded on both sides by normal faults and occurring on the continents or under the oceans. The central flat block forming th...

sudden infant death syndrome

(Encyclopedia)sudden infant death syndrome (SIDS) or crib death, sudden, unexpected, and unexplained death of an apparently healthy infant under one year of age (usually between two weeks and eight months old). SID...

Indus valley civilization

(Encyclopedia)Indus valley civilization, ancient civilization that arose about 3300 b.c. in the valley of the Indus River and its tributaries, in the northwestern portion of the Indian subcontinent, i.e., present-d...

Hetch Hetchy Valley

(Encyclopedia)Hetch Hetchy Valley, in Yosemite National Park, central Calif., on the Tuolumne River. It once rivaled Yosemite Valley in beauty and grandeur. O'Shaughnessy Dam (completed 1923; enl. 1938) turned the ...

Great Appalachian Valley

(Encyclopedia)Great Appalachian Valley: see under Appalachian Mountains. ...

Great Rift Valley

(Encyclopedia)Great Rift Valley, geological fault system of SW Asia and E Africa. It extends c.3,000 mi (4,830 km) from N Syria to central Mozambique. The northernmost extension runs S through Syria and Lebanon, th...

Glencoe, valley, Scotland

(Encyclopedia)Glencoe glĕnkōˈ [key], valley of the Coe River, Highland, W Scotland. It was the scene of the massacre of the Macdonald clan (Feb., 1692) by the Campbells, under the direction of John Campbell, 1st...

North Valley Stream

(Encyclopedia)North Valley Stream, uninc. town (1990 pop. 14,574), Nassau co., SE N.Y., on Long Island. It is chiefly residential.

Tennessee Valley Authority

(Encyclopedia)Tennessee Valley Authority (TVA), independent U.S. government corporate agency, created in 1933 by act of Congress; it is responsible for the integrated development of the Tennessee River basin. The h...