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Chladni, Ernst Florens Friedrich

(Encyclopedia) Chladni, Ernst Florens FriedrichChladni, Ernst Florens Friedrichĕrnst flōˈrĕns frēˈdrĭkh klädˈnē [key], 1756–1827, German physicist. An authority on acoustics, he made studies of the…

whirlwind

(Encyclopedia) whirlwind, revolving mass of air resulting from local atmospheric instability, such as that caused by intense heating of the ground by the sun on a hot summer day. Examples of…

Vistula Lagoon

(Encyclopedia) Vistula Lagoon, Pol. Zalew Wiślany, shallow inlet of the Baltic Sea, 322 sq mi (834 sq km), c.60 mi (100 km) long and from 6 to 11 mi (9.7–18 km) wide, N Poland and W Russia, separated…

Gobi

(Encyclopedia) GobiGobigōˈbē [key], Mandarin Yintai shamo, great stony desert of N central Asia, c.500,000 sq mi (1,295,000 sq km), extending c.1,000 mi (1,610 km) from east to west across SE…

Kalahari

(Encyclopedia) KalahariKalaharikäˌlähäˈrē [key], arid plateau region, c.100,000 sq mi (259,000 sq km), in Botswana, Namibia, and South Africa. The Kalahari, covered largely by reddish sand, lies…

Skara Brae

(Encyclopedia) Skara BraeSkara Braeskârˈə brā [key], Stone Age village, on Mainland in the Orkney Islands, N Scotland. Dating from c.3200 to 2200 b.c., the village was preserved under a sand dune…

Sandusky, city, United States

(Encyclopedia) SanduskySanduskysəndŭsˈkē, săn– [key], industrial city (1990 pop. 26,764), seat of Erie co., N central Ohio, a port of entry on Sandusky Bay of Lake Erie; inc. 1824. Its natural harbor…

Leopold, Aldo

(Encyclopedia) Leopold, Aldo, 1886–1948, American ecologist, b. Burlington, Iowa. He was an advocate for a “land ethic,” in which humans see themselves as part of a natural community. After work in…

loam

(Encyclopedia) loam, soil composed of sand, silt, clay, and organic matter in evenly mixed particles of various sizes. More fertile than sandy soils, loam is not stiff and tenacious like clay soils.…