Columbia Encyclopedia

(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...

(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...

(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...

(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...

(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...

(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...

(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 ...

(Encyclopedia) populism, in politics, a movement or political strategy that purports to endorse the will of the common or ordinary people, especially when distinguished from and opposed to a corrupt political or eco...

(Encyclopedia) Tell, William, legendary Swiss patriot. According to legend, Tell was a native of Uri, one of the Swiss forest cantons. Gessler, the canton's Austrian bailiff, decreed that Swiss citizens must remove ...

(Encyclopedia) Levi, Primo prēˈmō lāˈvē [key], 1919–87, Italian writer. A chemist of Jewish descent, Levi was sent to the concentration camp at Auschwitz during World War II. His first memoir, If This Is a M...