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silicon dioxide
(Encyclopedia)silicon dioxide: see silica.smog
(Encyclopedia)smog smŏg [key] [smoke+fog], dense, visible air pollution. Smog is commonly of two types. The gray smog of older industrial cities like London and New York derives from the massive combustion of coal...lime-sulfur
(Encyclopedia)lime-sulfur, mixture of calcium polysulfides formed by reacting (e.g., by boiling) calcium hydroxide (slaked lime) with sulfur. It is used as an insecticide and fungicide. ...brimstone
(Encyclopedia)brimstone: see sulfur.sulphur, chemical element
(Encyclopedia)sulphur: see sulfur.carbon cycle
(Encyclopedia) CE5 Carbon cycle carbon cycle, in biology, the exchange of carbon between living organisms and the nonliving environment. Inorganic carbon dioxide in the atmosphere is converted by plants into sim...Keeling, Charles David
(Encyclopedia)Keeling, Charles David, 1928–2005, U.S. geochemist, b. Scranton, Pa., Ph.D. Northwestern Univ., 1954. As a postdoctoral fellow at the California Institute of Technology (1953–56), he developed a s...chlorate
(Encyclopedia)chlorate pərklōrˈāt, –klôrˈ–, salts of chloric acid, HClO3, and perchloric acid, HClO4, respectively. Perchlorates are safer to handle than chlorates; they are more stable when exposed to ...Periodic Table of the Elements: Sulfur
(Encyclopedia)Periodic Table of the Elements: Sulfur ...ultramarine
(Encyclopedia)ultramarine, blue pigment used chiefly as a coloring material and as a bluing agent. A double silicate of sodium and aluminum with some sulfur, it is prepared commercially from kaolin, sulfur, soda as...Browse by Subject
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