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pumice

(Encyclopedia)pumice pŭmˈĭs [key], volcanic glass formed by the solidification of lava that is permeated with gas bubbles. Usually found at the surface of a lava flow, it is colorless or light gray and has the g...

Velasco, José María

(Encyclopedia)Velasco, José María hōsāˈ märēˈä vāläsˈkō [key], 1840–1912, Mexican landscape painter; teacher of Diego Rivera. A gifted artisan descended from a family of shawl weavers, he entered the...

water table

(Encyclopedia)water table, the top zone of soil and rock in which all voids are saturated with water. The level of the water table varies with topography and climate, and depends on the degree to which the groundwa...

Anguissola, Sofonisba

(Encyclopedia)Anguissola or Anguisciola, Sofonisba sōfōnēsˈbä ängˌēsōˈlä, –shōlä [key], c.1535–1625, Italian painter. Born to a noble family, she studied with Bernardino Campi and later with Michel...

landslide

(Encyclopedia)landslide, rapid slipping of a mass of earth or rock from a higher elevation to a lower level under the influence of gravity and water lubrication. More specifically, rockslides are the rapid downhill...

Grateful Dead, The

(Encyclopedia)Grateful Dead, The, American rock music group formed in 1965 by guitarists Jerry Garcia, 1942–95, and Bob Weir, 1947–, harmonica player Ron “Pigpen” McKernan, 1945–73, bassist Phil Lesh, 194...

Hastings, Thomas, American composer

(Encyclopedia)Hastings, Thomas, 1784–1872, American composer, b. Washington, Conn. Of his hymns, Rock of Ages is most famous. He compiled several books of hymns, including Musica Sacra (1815) and Spiritual Songs ...

Rossetti, Dante Gabriel

(Encyclopedia)Rossetti, Dante Gabriel rōsĕtˈē [key], 1828–82, English poet and painter; son of Gabriele Rossetti and brother of Christina Rossetti. He attended the Royal Academy and studied painting briefly ...

Manet, Édouard

(Encyclopedia)Manet, Édouard ādwärˈ mänāˈ [key], 1832–83, French painter, b. Paris. The son of a magistate, Manet went to sea rather than study law. On his return to Paris in 1850 he studied art with the F...

quartzite

(Encyclopedia)quartzite, usually metamorphic rock composed of firmly cemented quartz grains. Most often it is white, light gray, yellowish, or light brown, but is sometimes colored blue, green, purple, or black by ...