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Long Valley

(Encyclopedia)Long Valley, caldera, c.10 by 20 mi (15 by 30 km), Mono co., E Calif., at the eastern edge of the Sierra Nevada. Formed by a catastrophic eruption c.730,000 years ago, Long Valley and nearby areas hav...

batholith

(Encyclopedia)batholith, enormous mass of intrusive igneous rock, that is, rock made of once-molten material that has solidified below the earth's surface (see rock). Batholiths usually are granitic (see granite) i...

borax

(Encyclopedia)borax or sodium tetraborate decahydrate sōˈdēəm tĕˌtrəbôrˈāt dĕkˌəhīˈdrāt [key], chemical compound, Na2B4O7·10H2O; sp. gr. 1.73; slightly soluble in cold water; very soluble in hot wa...

Ibn Batuta

(Encyclopedia)Ibn Batuta ĭˈbən bäto͞oˈtä [key], 1304?–1378?, Muslim traveler, b. Tangier. No other medieval traveler is known to have journeyed so extensively. In 30 years (from c.1325) he made a series of...

Davis, John

(Encyclopedia)Davis or Davys, John, 1550?–1605, English navigator. He made his first voyage in search of the Northwest Passage in 1585, continuing the work of Martin Frobisher. On this voyage he discovered Cumber...

Tyson, Mike

(Encyclopedia)Tyson, Mike (Michael Gerald Tyson), 1966–, American boxer, b. Brooklyn, N.Y. At the age of 12, Tyson was sent to reform school, where he began to box. In a whirlwind career begun in 1985 when he tur...

Maury, Matthew Fontaine

(Encyclopedia)Maury, Matthew Fontaine fŏntānˈ môrˈē [key], 1806–73, American hydrographer and naval officer, b. near Fredericksburg, Va. Appointed a midshipman in 1825, he saw varied sea duty until a stagec...

Hakluyt, Richard

(Encyclopedia)Hakluyt, Richard hăkˈlo͞ot, hăkˈəlwĭt [key], 1552?–1616, English geographer. He graduated in 1574 from Oxford, where he later lectured on geography. A passionate interest in the history of di...

Champollion, Jean François

(Encyclopedia)Champollion, Jean François –fēzhäkˈ [key], 1778–1867, was an archaeologist and paleographer, a professor of Greek at Grenoble, and a curator of manuscripts at the Bibliothèque nationale. He a...

Faidherbe, Louis Léon César

(Encyclopedia)Faidherbe, Louis Léon César lwē lāôNˈ sāzärˈ fādĕrbˈ [key], 1818–89, French colonial administrator. He was a leading participant in the establishment of the French colonial empire in Afr...