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air mass

(Encyclopedia)air mass, large body of air within the earth's atmosphere in which temperature and humidity, although varying at different heights, remain similar throughout the body at any one height. Air masses for...

loess

(Encyclopedia)loess lĕs, lōˈəs, Ger. lös [key], unstratified soil deposit of varying thickness, usually yellowish and composed of fine-grained angular mineral particles mixed with clay. It is found in many reg...

home rule, municipal

(Encyclopedia)home rule, municipal, system adopted in many states of the United States by which a city is given the right to draft and amend its own charter and to regulate purely local matters without interference...

guinea pig

(Encyclopedia)guinea pig gĭnˈē [key], domesticated form of the cavy, Cavia porcellus, a South American rodent. It is unrelated to the pig; the name may refer to its shrill squeal. Guinea pigs were raised by the ...

crucifixion

(Encyclopedia)crucifixion, hanging on a cross, in ancient times a method of capital punishment. It was practiced widely in the Middle East but not by the Greeks. The Romans, who may have borrowed it from Carthage, ...

Patton, George Smith, Jr.

(Encyclopedia)Patton, George Smith, Jr., 1885–1945, American general, b. San Gabriel, Calif. A graduate of West Point (1909), he served in World War I and was wounded while commanding a tank brigade in France. Su...

trench warfare

(Encyclopedia)trench warfare. Although trenches were used in ancient and medieval warfare, in the American Civil War, and in the Russo-Japanese War (1904–5), they did not become important until World War I. The i...

Stickley, Gustav

(Encyclopedia)Stickley, Gustav, 1858–1942, American furniture designer, b. Osceola, Wis. Probably the best-known American associated with the arts and crafts movement, Stickley ran a Binghamton, N.Y., chair facto...

Black Hills

(Encyclopedia)Black Hills, rugged mountains, c.6,000 sq mi (15,540 sq km), enclosed by the Belle Fourche and Cheyenne rivers, SW S.Dak. and NE Wyo., and rising c.2,500 ft (760 m) above the surrounding Great Plains;...

liquid air

(Encyclopedia)liquid air, ordinary air that has been liquefied by compression and cooling to extremely low temperatures (see liquefaction). Its commercial preparation involves purification by washing to remove solu...