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progressivism

(Encyclopedia)progressivism, in U.S. history, a broadly based reform movement that reached its height early in the 20th cent. In the decades following the Civil War rapid industrialization transformed the United St...

oxygen

(Encyclopedia)oxygen, gaseous chemical element; symbol O; at. no. 8; interval in which at. wt. ranges 15.99903–15.99977; m.p. −218.4℃; b.p. −182.962℃; density 1.429 grams per liter at STP; valence −2. T...

Francis, Saint

(Encyclopedia)Francis, Saint, or Saint Francis of Assisi əsēˈzē [key], 1182?–1226, founder of the Franciscans, one of the greatest Christian saints, b. Assisi, Umbria, Italy. Two years before his death (122...

heart, in anatomy

(Encyclopedia)CE5 Cross section of heart, with arrows indicating direction of blood flow heart, muscular organ that pumps blood to all parts of the body. The rhythmic beating of the heart is a ceaseless activit...

meteorology

(Encyclopedia)meteorology, branch of science that deals with the atmosphere of a planet, particularly that of the earth, the most important application of which is the analysis and prediction of weather. Individual...

Mindanao

(Encyclopedia)Mindanao mĭndənäˈō, –nouˈ [key], island (1990 pop. 13,535,738), 36,537 sq mi (94,631 sq km), second largest of the Philippine islands, NE of Borneo. About one fifth of the island's population ...

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...

immigration

(Encyclopedia)immigration, entrance of a person (an alien) into a new country for the purpose of establishing permanent residence. Motives for immigration, like those for migration generally, are often economic, al...

Commonwealth of Independent States

(Encyclopedia)Commonwealth of Independent States (CIS), community of independent nations established by a treaty signed at Minsk, Belarus, on Dec. 8, 1991, by the heads of state of Russia, Belarus, and Ukraine. Bet...

alien

(Encyclopedia)alien, in law, any person residing in one political community while owing allegiance to another. A procedure known as naturalization permits aliens to become citizens. Each nation establishes conditio...