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drumlin
(Encyclopedia)drumlin drŭmˈlĭn [key], smooth oval hill of glacial drift, elongated in the direction of the movement of the ice that deposited it. Drumlins, which may be more than 150 ft (45 m) high and more than...genetic drift
(Encyclopedia)genetic drift: see genetics.Continental Congress
(Encyclopedia)Continental Congress, 1774–89, federal legislature of the Thirteen Colonies and later of the United States in the American Revolution and under the Articles of Confederation (see Confederation, Arti...Continental Divide
(Encyclopedia)Continental Divide, the “backbone” of a continent. In North America, from N Alaska to New Mexico, it moves along the crest of the Rocky Mts., which separates streams with outlets to the west of th...continental shelf
(Encyclopedia)continental shelf: see ocean.Continental System
(Encyclopedia)Continental System, scheme of action adopted by Napoleon I in his economic warfare with England from 1806 to 1812. Economic warfare had been carried on before 1806, but the system itself was initiated...boulder, in geology
(Encyclopedia)boulder, large rock fragment formed by detachment from its parent consolidated rock by weathering and erosion. In engineering and geology, especially in the United States, the term is applied to loose...mountain
(Encyclopedia)mountain, high land mass projecting conspicuously above its surroundings and usually of limited width at its summit. Although isolated mountains are not unusual, mountains commonly form ranges, compri...Arctic Ocean
(Encyclopedia)Arctic Ocean, the smallest ocean, c.5,400,000 sq mi (13,986,000 sq km), located entirely within the Arctic Circle and occupying the region around the North Pole. The Arctic basin was almost wholly u...glacier
(Encyclopedia)glacier, moving mass of ice that survives year to year, formed by the compacting of snow into névé and then into granular ice and set in motion outward and downward by the force of gravity and the s...Browse by Subject
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