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ozone layer

(Encyclopedia)ozone layer or ozonosphere, region of the stratosphere containing relatively high concentrations of ozone, located at altitudes of 12–30 mi (19–48 km) above the earth's surface. Ozone in the ozone...

Wilkinson, James

(Encyclopedia)Wilkinson, James, 1757–1825, American general and one of the most corrupt and devious officers in the nation's early army, b. Calvert co., Md. Abandoning his medical studies in 1776 to join the army...

Arnold, Benedict

(Encyclopedia)Arnold, Benedict, 1741–1801, American Revolutionary general and traitor, b. Norwich, Conn. As a youth he served for a time in the colonial militia in the French and Indian Wars. He later became a pr...

Portland, cities, United States

(Encyclopedia)Portland. 1 City (1990 pop. 64,358), seat of Cumberland co., SW Maine, situated on a small peninsula and adjacent land, with a large, deepwater harbor on Casco Bay; settled c.1632, set off from Falmou...

Vérendrye, Pierre Gaultier de Varennes, sieur de la

(Encyclopedia)Vérendrye, Pierre Gaultier de Varennes, sieur de la pyĕr gōtyāˈ də värĕnˈ syör də lä vāräNdrēˈ [key], 1685–1749, explorer in W Canada and the United States, b. Trois Rivières (Three...

Jerusalem, Latin Kingdom of

(Encyclopedia)Jerusalem, Latin Kingdom of, feudal state created by leaders of the First Crusade (see Crusades) in the areas they had wrested from the Muslims in Syria and Palestine. In 1099, after their capture of ...

refrigeration

(Encyclopedia)CE5 Compression system of refrigeration refrigeration, process for drawing heat from substances to lower their temperature, often for purposes of preservation. Refrigeration in its modern, portabl...

rapid transit

(Encyclopedia)rapid transit, transportation system designed to allow passenger travel within or throughout an urban area, usually employing surface, elevated, or underground railway systems or some combination of t...

French and Indian Wars

(Encyclopedia)French and Indian Wars, 1689–1763, the name given by American historians to the North American colonial wars between Great Britain and France in the late 17th and the 18th cent. They were really cam...

hockey, ice

(Encyclopedia)hockey, ice, team sport in which players use sticks to propel a hard, round disk into a net-backed goal. The NHL long regarded itself as the world's elite, but the overwhelming superiority of the ...