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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 ...

silicon

(Encyclopedia)silicon, nonmetallic chemical element; symbol Si; at. no. 14; interval in which at. wt. ranges 28.084–28.086; m.p. 1,410℃; b.p. 2,355℃; sp. gr. 2.33 at 25℃; valence usually +4. Silicon is the ...

silicon carbide

(Encyclopedia)silicon carbide, chemical compound, SiC, that forms extremely hard, dark, iridescent crystals that are insoluble in water and other common solvents. Widely used as an abrasive, it is marketed under su...

silicon dioxide

(Encyclopedia)silicon dioxide: see silica.

Cumberland Valley

(Encyclopedia)Cumberland Valley, 75 mi (121 km) long and from 15 to 20 mi (24–32 km) wide, part of the great Appalachian valley, between the Potomac and Susquehanna rivers, W Md. and S Pa. It is a fertile farming...

Death Valley

(Encyclopedia)Death Valley, SE Calif. and SW Nev., a deep, arid basin, 140 mi (225 km) long, bordered on the W by the Panamint Range and on the E by the Amargosa Range. In summer the valley has recorded some of the...

Coachella Valley

(Encyclopedia)Coachella Valley kōˌəchĕlˈə [key], arid region, SE Calif., N of the Salton Sea. Water is brought into the region by artesian wells and by the Coachella Canal (123 mi/198 km long), a branch of th...

Fergana Valley

(Encyclopedia)Fergana Valley or Ferghana Valley, region, 8,494 sq mi (22,000 sq km), Central Asia, divided among Uzbekistan, Tajikistan, and Kyrgyzstan. The Fergana Range (part of the Tian Shan system) rises in the...

Ferghana Valley

(Encyclopedia)Ferghana Valley, region, Central Asia: see Fergana Valley. ...

Fountain Valley

(Encyclopedia)Fountain Valley, city (2020 pop. 57,047), Orange co., S Calif.; inc. 1957. Chiefly residential, Fountain Valley also has diverse manufactures, including...