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Mammoth Cave National Park

(Encyclopedia)Mammoth Cave National Park, 52,830 acres (21,396 hectares), central Kentucky, authorized 1926, est. 1941. Located in a hilly, forested region, it offers numerous outdoor activities. It is the site of ...

paraplegia

(Encyclopedia)paraplegia pârˌəplēˈjēə [key], paralysis of the lower part of the body, commonly affecting both legs and often internal organs below the waist. When both legs and arms are affected, the conditi...

Banerjee, Abhijit Vanayak

(Encyclopedia)Banerjee, Abhijit Vanayak, 1961–, Indian-American economist, b. Mumbai, Ph.D. Harvard, 1988. He taught economics at Princeton (1988–92) and Harvard (1992–93) before moving to the Massachusetts I...

Yucca Mountain

(Encyclopedia)Yucca Mountain, mountain in the SW Nevada desert about 100 mi (161 km) northwest of Las Vegas. It is the proposed site of a Dept. of Energy (DOE) repository for up to 77,000 metric tons of nuclear was...

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;...

rationing

(Encyclopedia)rationing, allotment of scarce supplies, usually by governmental decree, to provide equitable distribution. It may be employed also to conserve economic resources and to reinforce price and production...

Rostovtzeff, Michael Ivanovich

(Encyclopedia)Rostovtzeff, Michael Ivanovich rŏstŏvˈtsĕf [key], 1870–1952, American historian, b. Kiev, Ukraine. He studied at the Univ. of St. Petersburg where he was professor of Latin and of Roman history ...

bald cypress

(Encyclopedia)bald cypress, common name for members of the Taxodiaceae, a small family of deciduous or evergreen conifers with needlelike or scalelike leaves and woody cones. Most species of the family are trees of...

prairies

(Encyclopedia)prairies, generally level, originally grass-covered and treeless plains of North America, stretching from W Ohio through Indiana, Illinois, and Iowa to the Great Plains region. The prairie belt also e...

tide

(Encyclopedia)tide, alternate and regular rise and fall of sea level in oceans and other large bodies of water. These changes are caused by the gravitational attraction of the moon and, to a lesser extent, of the s...