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Kharkiv

(Encyclopedia)Kharkiv khärˈkəf [key], Rus. Kharkov, city (1990 est. pop. 1,600,000), capital of Kharkiv region, E Ukraine, at the confluence of the Kharkiv, Lopan, and Udy rivers in the upper Donets valley. Ukra...

Guienne

(Encyclopedia)Guienne, Fr. Guyenne both: gēĕnˈ, gwē– [key], region of SW France. The name referred to different territories at different times. Guienne as it existed from the time of Henry IV (late 16th–ear...

Altai

(Encyclopedia)Altai or Altay both: ăltīˈ, äl–, ălˈtī, Rus. əltīˈ [key], geologically complex mountain system of central Asia; largely in the Altai Republic, Russia, and in Kazakhstan, but extending into...

Tuva Republic

(Encyclopedia)Tuva Republic or Tyva Republic both: to͞oˈvə, Rus. to͞oväˈ, Tuvan to͞owäˈ [key], constituent republic (1990 est. pop. 366,000), 65,830 sq mi (170,500 sq km), extreme S Siberian Russia, on the...

paleomagnetism

(Encyclopedia)paleomagnetism, study of the intensity and orientation of the earth's magnetic field as preserved in the magnetic orientation of certain minerals found in rocks formed throughout geologic time. Paleom...

Yellowstone National Park

(Encyclopedia)Yellowstone National Park, 2,219,791 acres (899,015 hectares), the world's first national park (est. 1872), NW Wyo., extending into Montana and Idaho. It lies mainly on a broad plateau in the Rocky Mt...

Pacific Ocean

(Encyclopedia)CE5 Pacific Ocean, largest and deepest ocean, c.70,000,000 sq mi (181,300,000 sq km), occupying about one third of the earth's surface; named by the explorer Ferdinand Magellan; the southern part i...

Volga

(Encyclopedia)Volga vŏlˈgə, Rus. vôlˈgə [key], river, c.2,300 mi (3,700 km) long, central and E European Russia. It is the longest river of Europe and the principal waterway of Russia, being navigable (with l...

Tennessee Valley Authority

(Encyclopedia)Tennessee Valley Authority (TVA), independent U.S. government corporate agency, created in 1933 by act of Congress; it is responsible for the integrated development of the Tennessee River basin. The h...

brick

(Encyclopedia)brick, ceramic structural material that, in modern times, is made by pressing clay into blocks and firing them to the requisite hardness in a kiln. Bricks in their most primitive form were not fired b...