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fall line

(Encyclopedia) fall line, boundary between an upland region and a coastal plain across which rivers from the upland region drop to the plain as falls or rapids. A fall line is formed in an area where…

Yenisei

(Encyclopedia) YeniseiYeniseiyĕnĭsāˈ, Rus. yĕnyĭsyāˈ [key], chief river of Siberia, c.2,500 mi (4,020 km) long, central Siberian Russia. It is formed at Kyzyl, Tuva Republic, by the junction of the…

Iowa, state, United States

(Encyclopedia) CE5 IowaIowaīˈəwə [key], midwestern state in the N central United States. It is bounded by the Mississippi River, across which lie Wisconsin and Illinois (E); Missouri (S); Nebraska…

Quintana Roo

(Encyclopedia) Quintana RooQuintana Rookēntäˈnä rōˈō [key], state (1990 pop. 493,277), 19,630 sq mi (50,842 sq km), SE Mexico, on the Caribbean. Chetumal is the capital. Occupying most of the eastern…

bark, in botany

(Encyclopedia) bark, outer covering of the stem of woody plants, composed of waterproof cork cells protecting a layer of food-conducting tissue—the phloem or inner bark (also called bast). As the…

Pike, Zebulon Montgomery

(Encyclopedia) Pike, Zebulon Montgomery, 1779–1813, American explorer, an army officer, b. Lamberton (now part of Trenton), N.J. He joined the army (c.1793) and was commissioned second lieutenant in…