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eutrophication
(Encyclopedia) eutrophicationeutrophicationy&oomacr;trōˌfĭkāˈshən [key], aging of a lake by biological enrichment of its water. In a young lake the water is cold and clear, supporting little life…Platen, August Graf von
(Encyclopedia) Platen, August Graf vonPlaten, August Graf vonouˈg&oobreve;st gräf fən pläˈtən [key], 1796–1835, German poet, whose original name was August Graf von Platen-Hallermünde. An…igloo
(Encyclopedia) iglooiglooĭgˈl&oomacr; [key] [Inuit,=house]. The Eskimos traditionally had three types of houses. A summer house, which was basically a tent, a winter house, which was usually…chinook, warm, dry air mass
(Encyclopedia) chinook, warm, dry air mass that descends the eastern slopes of the U.S. and Canadian Rocky Mts. after having lost moisture by condensation over the western slopes. Chinooks occur…frostweed
(Encyclopedia) frostweed or frostwort, North American woodland flowers (Helianthemum canadense and sometimes other related species) of the family Cistaceae (rockrose family). In cold weather,…sprain
(Encyclopedia) sprain, stretching or wrenching of the ligaments and tendons of a joint, often with rupture of the tissues but without dislocation. Sprains occur most commonly at the ankle, knee, or…sneeze
(Encyclopedia) sneeze, involuntary violent expiration of air through the nose and mouth. It results from stimulation of the nervous system in the nose, causing sudden contraction of the muscles of…Dewar flask
(Encyclopedia) Dewar flask [for Sir James Dewar], container after which the common thermos bottle is patterned. It consists of two flasks, one placed inside the other, with a vacuum between. The…Vavilov, Sergei Ivanovich
(Encyclopedia) Vavilov, Sergei IvanovichVavilov, Sergei Ivanovichsyĭrgāˈ ēväˈnəvĭch [key]Vavilov, Sergei Ivanovich vəvēˈləf [key], 1891–1951, Russian physicist. In 1932 he became director of the P. N…degree-day
(Encyclopedia) degree-day, a unit of measure used to estimate the fuel and power requirements in heating and cooling a building; it is equal to a difference of 1 degree between the outdoor daily…Trending
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