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hurricane

(Encyclopedia)CE5 View into the eye of a hurricane showing the structure of the surrounding cloud wall hurricane, tropical cyclone in which winds attain speeds greater than 74 mi (119 km) per hr. Wind speeds gu...

chinook, warm, dry air mass

(Encyclopedia)chinook, warm, dry air mass that descends the eastern slopes of the U.S. and Canadian Rocky Mts. after having lost moisture by condensation over the western slopes. Chinooks occur mainly in winter. Th...

cline

(Encyclopedia)cline, in biology, any gradual change in a particular characteristic of a population of organisms from one end of the geographical range of the population to the other. Gradients of characteristics us...

Geysir

(Encyclopedia)Geysir gāˈsĭr [key], hot spring, SW Iceland, c.75 mi (120 km) W of Reykjavík. Although in medieval times it erupted three times daily, weeks now elapse between eruptions. The height and temperatur...

spontaneous combustion

(Encyclopedia)spontaneous combustion, phenomenon in which a substance unexpectedly bursts into flame without apparent cause. In ordinary combustion, a substance is deliberately heated to its ignition point to make ...

Errett, Isaac

(Encyclopedia)Errett, Isaac ĕrˈĭt [key], 1820–88, American minister of the Disciples of Christ, b. New York City. After years of pastoral and evangelistic work in pioneer towns of Ohio and Michigan, he became ...

International Union of Pure and Applied Chemistry

(Encyclopedia)International Union of Pure and Applied Chemistry (IUPAC), an international organization est. 1919 to advance the chemical sciences and contribute to the application of chemistry to the service of hum...

Norman, Montagu Collet, 1st Baron Norman of St. Clere

(Encyclopedia)Norman, Montagu Collet, 1st Baron Norman of St. Clere, 1871–1950, English financier. He was governor of the Bank of England from 1920 to 1944, a tenure of office that broke all tradition. He long fa...

Vieuxtemps, Henri

(Encyclopedia)Vieuxtemps, Henri äNrēˈ vyötäNˈ [key], 1820–81, Belgian violinist and composer. He toured Europe and the United States and taught in St. Petersburg (1846–51), where he was also court violini...

derecho

(Encyclopedia)derecho dərāˈchō [key], a long-lived windstorm over a wide expanse that is associated with a line of rapidly moving thunderstorms or showers. The winds in a derecho generally exceed 57 mph (92 kph...