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Oahu

(Encyclopedia)Oahu ōäˈho͞o [key], island (1990 pop. 836,231), 593 sq mi (1,536 sq km), third largest and chief island of Hawaii, part of Honolulu co., between Molokai and Kauai. Oahu is composed of two parallel...

Taurus, mountain chain, Turkey

(Encyclopedia)Taurus tôrōsˈ [key], mountain chain, S Turkey, extending c.350 mi (560 km) roughly parallel to the Mediterranean coast of S Asia Minor. It forms the southern border of the Anatolian plateau. Its no...

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;...

Konya

(Encyclopedia)Konya kōnˈyä [key], city (1990 pop. 509,208), capital of Konya prov., S central Turkey. It is the trade center of a rich agricultural and livestock-raising region. Manufactures include cement, carp...

aqueduct

(Encyclopedia)aqueduct ăkˈwədŭkt [key] [Lat.,=conveyor of water], channel or trough built to convey water, chiefly for providing a densely populated region with a supply of freshwater. The flow in aqueducts is ...

city-state

(Encyclopedia)city-state, in ancient Greece, Italy, and Medieval Europe, an independent political unit consisting of a city and surrounding countryside. The first city-states were in Sumer, but they reached their p...

Saint Helens, Mount

(Encyclopedia)Saint Helens, Mount, volcanic peak, 8,363 ft (2,549 m; 9,677 ft/2,950 m before its 1980 eruption) high, SW Wash., historically the most active volcano in the Cascade Range. Dormant since 1857, Mt. St....

solar cell

(Encyclopedia)solar cell, semiconductor devised to convert light to electric current. It is a specially constructed diode, usually made of forms of crystalline silicon or of thin films (as of copper indium gallium ...

Tethys , in astronomy

(Encyclopedia)Tethys tēˈthĭs [key], in astronomy, one of the named moons, or natural satellites, of Saturn. Also known as Saturn III (or S3), Tethys is 659 mi (1060 km) in diameter, orbits Saturn at a mean dista...

Central America

(Encyclopedia)Central America, narrow, southernmost region (c.202,200 sq mi/523,698 sq km) of North America, linked to South America at Colombia. It separates the Caribbean from the Pacific. Historically, geographe...