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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...power, electric
(Encyclopedia)power, electric, energy dissipated in an electrical or electronic circuit or device per unit of time. The electrical energy supplied by a current to an appliance enables it to do work or provide some ...Russo-Turkish Wars
(Encyclopedia)Russo-Turkish Wars. The great eastward expansion of Russia in the 16th and 17th cent., during the decline of the Ottoman Empire, nevertheless left the shores of the Black Sea in the hands of the Ottom...Slavs
(Encyclopedia)Slavs slävz, slăvz [key], the largest ethnic and linguistic group of peoples in Europe belonging to the Indo-European linguistic family. It is estimated that the Slavs number over 300 million in the...insurance
(Encyclopedia)insurance or assurance, device for indemnifying or guaranteeing an individual against loss. Reimbursement is made from a fund to which many individuals exposed to the same risk have contributed certai...Reconstruction
(Encyclopedia)Reconstruction, 1865–77, in U.S. history, the period of readjustment following the Civil War. At the end of the Civil War, the defeated South was a ruined land. The physical destruction wrought by t...World War II
(Encyclopedia)World War II, 1939–45, worldwide conflict involving every major power in the world. The two sides were generally known as the Allies and the Axis. Although hostilities came to an end in Sept...Civil War, in U.S. history
(Encyclopedia)Civil War, in U.S. history, conflict (1861–65) between the Northern states (the Union) and the Southern states that seceded from the Union and formed the Confederacy. It is generally known in the So...Browse by Subject
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