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migration

(Encyclopedia)migration, of people, geographical movements of individuals or groups for the purpose of permanently resettling. Normal internal migration has been characterized by a population shift from rural t...

atmosphere

(Encyclopedia)CE5 Atmosphere atmosphere [Gr.,=sphere of air], the mixture of gases surrounding a celestial body with sufficient gravity to maintain it. Although some details about the atmospheres of other plane...

Washington, D.C.

(Encyclopedia)Washington, D.C., capital of the United States, coextensive (since 1878, when Georgetown became a part of Washington) with the District of ...

New York, city, United States

(Encyclopedia)New York, city (2020 pop. 8,336,817), land area 304.8 sq mi (789.4 sq km), SE N.Y., largest city in the United States and one of the largest in the worl...

matter

(Encyclopedia)matter, anything that has mass and occupies space. Matter is sometimes called koinomatter (Gr. koinos=common) to distinguish it from antimatter, or matter composed of antiparticles. The atomic th...

global warming

(Encyclopedia)global warming, the gradual increase of the temperature of the earth's lower atmosphere as a result of the increase in greenhouse gases since the Industrial Revolution. Global warming and its effects,...

Manitoba

(Encyclopedia)CE5 Manitoba mănĭtōˈbə [key], province (2001 pop. 1,119,583), 250,934 sq mi (650,930 sq km), including 39,215 sq mi (101,580 sq km) of water surface, W central Canada. The history of Manit...

bacteria

(Encyclopedia)bacteria [pl. of bacterium], microscopic unicellular prokaryotic organisms characterized by the lack of a membrane-bound nucleus and membrane-bound organelles. Once considered a part of the plant king...

Chicago, city, United States

(Encyclopedia)Chicago shĭkäˈgō, shĭkôˈgō [key], city (2020 pop. 2,746,388), seat of Cook co...

Mississippi, river, United States

(Encyclopedia)Mississippi, river, principal river of the United States, c.2,350 mi (3,780 km) long, exceeded in length only by the Missouri, the chief of its numerous tributaries. The combined Missouri-Mississippi ...