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hardpan

(Encyclopedia)hardpan, condition of the soil or subsoil in which the soil grains become cemented together by such bonding agents as iron oxide and calcium carbonate, forming a hard, impervious mass. It is disadvant...

Symington, William Stuart

(Encyclopedia)Symington, William Stuart, 1901–88, U.S. senator (1953–76), b. Amherst, Mass. He interrupted a successful business career in 1941 to accept a War Department assignment involving a study of airplan...

Ipswich, town, United States

(Encyclopedia)Ipswich, town (2020 pop. 13,785), Essex co., NE Mass., on the Ipswich River and Ipswich Bay; inc. 1634. Ipswich clams are found there. Tourism and the p...

whirlwind

(Encyclopedia)whirlwind, revolving mass of air resulting from local atmospheric instability, such as that caused by intense heating of the ground by the sun on a hot summer day. Examples of whirlwinds are waterspou...

avalanche

(Encyclopedia)avalanche, rapidly descending large mass of snow, ice, soil, rock, or mixtures of these materials, sliding or falling in response to the force of gravity. Avalanches, which are natural forms of erosio...

Blanchard, Jean Pierre

(Encyclopedia)Blanchard, Jean Pierre fräNswäˈ [key], 1753–1809, French balloonist. In 1785 he made with Dr. John Jeffries of Boston, Mass., the first crossing by air of the English Channel. His ascents at Phil...

Howe, Clarence Decatur

(Encyclopedia)Howe, Clarence Decatur hou [key], 1886–1960, Canadian civil engineer and cabinet minister, b. Waltham, Mass. He went to Canada in 1908 as professor of civil engineering at Dalhousie Univ. He founded...

leaven

(Encyclopedia)leaven lĕvˈən [key], agent used to raise bread or other flour foods. Physical leavens include water vapor, which is released as steam at high temperatures (as in popovers), and air, which is incorp...

tornado

(Encyclopedia)tornado, dark, funnel-shaped cloud containing violently rotating air that develops below a heavy cumulonimbus cloud mass and extends toward the earth. The funnel twists about, rises and falls, and whe...

Chicopee

(Encyclopedia)Chicopee chĭkˈəpē [key], city (2020 pop. 54,530), Hampden co., SW Mass., at the confluence ...