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oxidation and reduction
(Encyclopedia)oxidation and reduction, complementary chemical reactions characterized by the loss or gain, respectively, of one or more electrons by an atom or molecule. Originally the term oxidation was used to re...coral reefs
(Encyclopedia)coral reefs, limestone formations produced by living organisms, found in shallow, tropical marine waters. In most reefs, the predominant organisms are stony corals, colonial cnidarians that secrete an...Justice, United States Department of
(Encyclopedia)Justice, United States Department of, federal executive department established in 1870 and charged with providing the means for enforcing federal laws, furnishing legal counsel in federal cases, and c...Little Entente
(Encyclopedia)Little Entente äntäntˈ [key], loose alliance formed in 1920–21 by Czechoslovakia, Romania, and Yugoslavia. Its specific purposes were the containment of Hungarian revisionism (of the terms of the...Ribbentrop, Joachim von
(Encyclopedia)Ribbentrop, Joachim von yōˈaäkhĭm fən rĭbˈəntrôp [key], 1893–1946, German foreign minister (1938–45). After World War I he became a wealthy champagne merchant. He joined the National Soci...halo, in meteorology
(Encyclopedia)halo, in meteorology, short-lived circles or arcs, and less commonly spikes and crosses, of colored or whitish light surrounding the moon or sun or in clouds as seen from above. A halo occurs when the...condensation
(Encyclopedia)condensation, in physics, change of a substance from the gaseous (vapor) to the liquid state (see states of matter). Condensation is the reverse of vaporization, or change from liquid to gas. It can b...burn
(Encyclopedia)burn, injury resulting from exposure to heat, electricity, radiation, or caustic chemicals. Three degrees of burn are commonly recognized. In first-degree burns the outer layer of skin, called epiderm...pruning
(Encyclopedia)pruning, the horticultural practice of cutting away an unwanted, unnecessary, or undesirable plant part, used most often on trees, shrubs, hedges, and woody vines. Man uses pruning to remove diseased ...cockroach
(Encyclopedia)cockroach or roach, name applied to some 4,600 species of flat-bodied, oval insects in the order Blattodea. Cockroaches have long antennae, long legs adapted to running, and a flat extension of the up...Browse by Subject
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