(Encyclopedia) micamicamīˈkə [key], general term for a large group of minerals, hydrous silicates of aluminum and potassium, often containing magnesium, ferrous iron, ferric iron, sodium, and lithium…
(Encyclopedia) acid rain or acid deposition, form of precipitation (rain, snow, sleet, or hail) containing high levels of sulfuric or nitric acids (pH below 5.5–5.6). Produced when sulfur dioxide and…
(Encyclopedia) Constitution, U.S. 44-gun frigate, nicknamed Old Ironsides. It is perhaps the most famous vessel in the history of the U.S. navy. Authorized by Congress in 1794, the ship was launched…
(Encyclopedia) Andersen, Hans Christian, 1805–75, Danish poet, novelist, and writer of fairy tales. Born to an illiterate washerwoman and reared in poverty, he left Odense at 14 for Copenhagen, where…
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Approximate heights of some types of clouds
cloud, aggregation of minute particles of water or ice suspended in the air.
Cloudiness (or proportion of the sky covered by any…
(Encyclopedia) tire, device made of rubber and fabric and attached to the outer rim of a vehicle wheel. Solid rubber tires were in limited use before 1850; they are still used in some special…
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Snow-on-the-mountain, Euphorbia marginata
spurgespurgespûrj [key], common name for members of the Euphorbiaceae, a family of herbs, shrubs, and trees of greatly varied…
(Encyclopedia) Brown, Gordon (James Gordon Brown), 1951–, British politician. From 1975 to 1980 he taught at Edinburgh Univ. and Glasgow College of Technology; he then joined Scottish Television (…
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