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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...aviation
(Encyclopedia)aviation, operation of heavier-than-air aircraft and related activities. Aviation can be conveniently divided into military aviation, air transport, and general aviation. Military aviation includes al...Area 51
(Encyclopedia)Area 51, name for a U.S. military site, S Nev., c.80 mi (130 km) NNW of Las Vegas. Shrouded in secrecy since the mid-20th cent., it is located within the U.S. Air Force's enormous Nevada Test and Trai...Rapid City
(Encyclopedia)Rapid City, city (1990 pop. 54,523), seat of Pennington co., SW S.Dak., on Rapid Creek, in an irrigated farm region served by the Bureau of Reclamation's Rapid Valley project; founded 1876 after the d...Brown, Harold
(Encyclopedia)Brown, Harold, 1927–2019, American nuclear physicist and government official, b. New York City, Ph.D. Columbia, 1949. He joined (1952) the staff of the Lawrence Radiation Laboratory (now Lawrence Li...Aurora, cities, United States
(Encyclopedia)Aurora ərôrˈə, ô– [key]. 1 City (2020 pop. 386,261), Adams and Arapahoe counties, N central Colo., a growing suburb on the east side of Denver; inc. 1903. Founded d...ballistics
(Encyclopedia)ballistics bəlĭsˈtĭks [key], science of projectiles. Interior ballistics deals with the propulsion and the motion of a projectile within a gun or firing device. Its problems include the ignition a...McKinley, William
(Encyclopedia)McKinley, William, 1843–1901, 25th president of the United States (1897–1901), b. Niles, Ohio. He was educated at Poland (Ohio) Seminary and Allegheny College. After service in the Union army in t...Ball, George Wildman
(Encyclopedia)Ball, George Wildman, 1909–94, American lawyer and diplomat, b. Des Moines, Iowa. Admitted to the bar in 1934, he served (1942–44) as counsel in the Lend Lease Administration and the Foreign Econo...Hay-Herrán Treaty
(Encyclopedia)Hay-Herrán Treaty hā-ĕränˈ [key], 1903, aborted agreement between the United States and Colombia providing for U.S. control of the prospective Panama Canal and for U.S. acquisition of a canal zon...Browse by Subject
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