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quartz

(Encyclopedia)quartz, one of the commonest of all rock-forming minerals and one of the most important constituents of the earth's crust. Chemically, it is silicon dioxide, SiO2. It occurs in crystals of the hexagon...

reservoir

(Encyclopedia)reservoir rĕzˈəvôr, –vwär [key], storage tank or wholly or partly artificial lake for storing water. Building an embankment or dam to preserve a supply of water for irrigation is an ancient pra...

serpentine

(Encyclopedia)serpentine sûrˈpəntēn, –tīn [key], hydrous silicate of magnesium. It occurs in crystalline form only as a pseudomorph having the form of some other mineral and is generally found in the form of...

earth, in geology and astronomy

(Encyclopedia)CE5 A. Cross section of the earth, showing its shells B. Detailed cross section of the crust and upper mantle: The lithosphere consists of the hard rock in the crust and upper mantle, lying above t...

Gibraltar

(Encyclopedia)Gibraltar jĭbrôlˈtər [key], British overseas territory (2015 est. pop. 34,000), 2.5 sq mi (6.5 sq km), on a narrow, rocky peninsula extending into the Mediterranean Sea from SW Spain. Most of the ...

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...

Eleusis

(Encyclopedia)Eleusis ĭlo͞oˈsĭs [key], ancient city of Attica, Greece, 12 mi (20 km) NW of Athens. Through ancient times it was the seat of the Eleusinian Mysteries. There was a large temple to Demeter. The Ele...

Andromeda, in Greek mythology

(Encyclopedia)Andromeda ăndrŏmˈĭdə [key], in Greek mythology, princess of Ethiopia, daughter of King Cepheus, king of Ethiopia, and Cassiopeia. According to most legends Cassiopeia angered Poseidon by saying t...

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...

Gold Butte National Monument

(Encyclopedia)Gold Butte National Monument, 296,937 acres (90,506 hectares), SE Utah, est. 2016 and managed by the Bureau of Land Management. Named for a mining ghost town, the monument embraces a rugged desert lan...