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magnesium

(Encyclopedia)magnesium măgnēˈzēəm, –zhəm [key], metallic chemical element; symbol Mg; at. no. 12; at. wt. 24.3050; m.p. about 648.8℃; b.p. about 1,090℃; sp. gr. 1.738 at 20℃; valence +2. In 1808, Sir...

Somalia

(Encyclopedia)CE5 Somalia sōmäˈleə [key], officially Federal Republic of Somalia, country (2015 est. pop. 10,616,000), 246,200 sq mi (637,657 sq km), extreme E Africa. It is directly south of the Arabian pen...

wave, in the earth sciences

(Encyclopedia)CE5 A. Diagram of wave: Wave travels one wavelength during one period B. Diagram of wave: Phase relationships wave, in oceanography, an oscillating movement up and down, of a body of water caused ...

Malta

(Encyclopedia)CE5 Malta môlˈtə [key], officially Republic of Malta, republic (2015 est. pop. 428,000), 122 sq mi (316 sq km), in the Mediterranean Sea S of Sicily. It comprises the islands of Malta (95 sq mi/...

Wagner, Richard

(Encyclopedia)Wagner, Richard vägˈnər [key], 1813–83, German composer, b. Leipzig. Wagner's second wife, Cosima Wagner, 1837–1930, was the daughter of Liszt and the comtesse d'Agoult. From 1857 to 1870 sh...

Baltimore

(Encyclopedia)Baltimore, city (2020 pop. 575,584), N central Md., surrounded by but politically independent of Baltimore co., on the Patapsco River estuary, an arm of...

submarine

(Encyclopedia)submarine, naval craft capable of operating for an extended period of time underwater. Submarines are almost always warships, although a few are used for scientific, business, or other purposes (see a...

Cape Verde

(Encyclopedia)CE5 Cape Verde vûd [key], Port. Cabo Verde, officially Republic of Cape Verde, republic (...

relativity

(Encyclopedia)relativity, physical theory, introduced by Albert Einstein, that discards the concept of absolute motion and instead treats only relative motion between two systems or frames of reference. One consequ...

Wilson, Woodrow

(Encyclopedia)Wilson, Woodrow (Thomas Woodrow Wilson), 1856–1924, 28th President of the United States (1913–21), b. Staunton, Va. Wilson's writings on history and jurisprudence include Division and Reunion, 1...