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nitrogen cycle
(Encyclopedia)CE5 Nitrogen cycle nitrogen cycle, the continuous flow of nitrogen through the biosphere by the processes of nitrogen fixation, ammonification (decay), nitrification, and denitrification. Nitrogen...Tolstoy, Leo, Count
(Encyclopedia)Tolstoy, Leo, Count, Rus. Lev Nikolayevich Tolstoi (lyĕf), 1828–1910, Russian novelist and philosopher, considered one of the world's greatest writers. About 1876 the doubts that had beset Tols...Putin, Vladimir Vladimirovich
(Encyclopedia)Putin, Vladimir Vladimirovich vlŭdēmˈyĭr vlŭdēmˌyĭrˈəvyĭch po͞oˈtyĭn [key], 1952–, Russian government official and political leader, b. Leningrad (now St. Petersburg). After graduating...motion picture photography
(Encyclopedia)motion picture photography or cinematography, photographic arts and techniques involved in making motion pictures. See also photography, still. Cinematography developed as a separate craft ve...ballet
(Encyclopedia)CE5 The five classical positions in ballet ballet bălˈā, bălāˈ [key] [Ital. ballare=to dance], classic, formalized solo or ensemble dancing of a highly controlled, dramatic nature performed ...space exploration
(Encyclopedia)CE5 Moon mission assembly CE5 Stages in a moon mission shown counterclockwise from launching on the first day to splashdown on the ninth day. space exploration, the investigation of physical co...Bulgaria
(Encyclopedia)CE5 Bulgaria bŭlgârˈēə [key], Bulgarian Balgarija, officially Republic of Bulgaria, r...World War I
(Encyclopedia)World War I, 1914–18, also known as the Great War, conflict, chiefly in Europe, among most of the great Western powers. It was the largest war the world had yet seen. World War I and the resul...Union of Soviet Socialist Republics
(Encyclopedia)Union of Soviet Socialist Republics (USSR), Rus. Soyuz Sovetskikh Sotsialisticheskikh Respublik, former republic. It was established in 1922 and dissolved in 1991. The Soviet Union was the first state...Russia
(Encyclopedia)CE5 CE5 Russia, officially the Russian Federation, Rus. Rossiya, republic (2015 est. pop. 143,888,000), 6,591,100 sq mi (17,070,949 sq km). The largest country in the world by area, Russia is bou...Browse by Subject
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