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sodium nitrate

(Encyclopedia)sodium nitrate, chemical compound, NaNO3, a colorless, odorless crystalline compound that closely resembles potassium nitrate (saltpeter or niter) in appearance and chemical properties. It is soluble ...

Marmaduke, John Sappington

(Encyclopedia)Marmaduke, John Sappington märˈmədo͞okˌ [key], 1833–87, Confederate general in the American Civil War, b. Arrow Rock, Mo. He served in the expedition against the Mormons and in Western army pos...

Glorioso Islands

(Encyclopedia)Glorioso Islands glōrˌēōˈsō, –zō [key], Fr. Îles Glorieuses, island group, c.2 sq mi (5 sq km), in the Mozambique Channel, W Indian Ocean, 125 mi (200 km) WNW of N Madagascar, part of the Sc...

Fichtelgebirge

(Encyclopedia)Fichtelgebirge fĭkhˈtəlgəbĭrˌgə [key], mountain knot, in SE Germany, between Bayreuth and the Czech border; rises to 3,447 ft (1,051 m) in Schneeberg peak. The rugged mountains are composed mai...

pyroxene

(Encyclopedia)pyroxene pīˈrŏksēn [key], name given to members of a group of widely distributed rock minerals called metasilicates in which magnesium, iron, and calcium, often with aluminum, sodium, lithium, man...

mining

(Encyclopedia)mining, extraction of solid mineral resources from the earth. These resources include ores, which contain commercially valuable amounts of metals, such as iron and aluminum; precious stones, such as d...

Capitol Reef National Park

(Encyclopedia)Capitol Reef National Park: 241,904 acres (97,971 hectares), S Utah. The park features a dome-shaped white rock, said to resemble the U.S. Capitol, and a maze of deep canyons, arches, and monoliths cu...

chiton

(Encyclopedia)CE5 A. Dorsal view of a chiton, representative mollusk of the class Amphineura B. Internal anatomy of a chiton chiton kīˈtən [key], common name for rock-clinging marine mollusks of the class Po...

hogback

(Encyclopedia)hogback, sharp-crested ridge with steep slopes on both sides, formed by the erosion of steeply tilted rock layers. Hogbacks are commonly formed along the eroded flanks of large, tightly folded anticli...

feldspar

(Encyclopedia)feldspar fĕlˈspär [key], an abundant group of rock-forming minerals which constitute 60% of the earth's crust. Chemically the feldspars are silicates of aluminum, containing sodium, potassium, iron...