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Spring Valley

(Encyclopedia)Spring Valley. 1 Uninc. community (1990 pop. 55,331), within the confines of San Diego, San Diego co., SW Calif., on Sweetwater Lake. It is a rapidly growing residential community, with some light ind...

Squaw Valley

(Encyclopedia)Squaw Valley, valley, NE Calif., in the Sierra Nevada Mts., NW of Lake Tahoe. A well-known ski and winter recreational resort, it was the site of the 1960 Winter Olympics. Ski lifts and trails are on ...

Silicon Valley

(Encyclopedia)Silicon Valley, an industrial region, approximately 20 mi (32 km) long, in the Santa Clara Valley between Palo Alto and San Jose, mainly in Santa Clara and San Mateo counties, W central Calif., where ...

Simi Valley

(Encyclopedia)Simi Valley sēˈmē, sĭmˈē [key], city (1990 pop. 100,217), Ventura co., SW Calif. in an oil, fruit, and farm region; laid out 1887, inc. 1969. Highly residential, the city also produces a variety...

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...

Sulaiman Mountains

(Encyclopedia)Sulaiman Mountains so͞olīmänˈ [key], range, extending c.250 mi (400 km) from N to S along the western edge of the Indus River valley in E Baluchistan province, central Pakistan. The twin peaks of ...

Neolithic period

(Encyclopedia)Neolithic period or New Stone Age. The term neolithic is used, especially in archaeology and anthropology, to designate a stage of cultural evolution or technological development characterized by the ...

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...