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halogen

(Encyclopedia)halogen hălˈəjĕn [key] [Gr.,=salt-bearing], any of the chemically active elements found in Group 17 of the periodic table; the name applies especially to fluorine (symbol F), chlorine (Cl), bromin...

Sierra Morena

(Encyclopedia)Sierra Morena syāˈrä mōrāˈnä [key], mountain range, SW Spain, extending c.375 mi (600 km) eastward along the southern edge of the Meseta (central plateau) from the Portuguese border to the Sier...

Superior

(Encyclopedia)Superior, city (1990 pop. 27,134), seat of Douglas co., NW Wis., on Superior Bay of Lake Superior, at the mouths of the St. Louis and the Nemadji rivers; inc. 1883. It is a port of entry with many rai...

Cerro de Pasco

(Encyclopedia)Cerro de Pasco sĕrˈrō ᵺā päsˈkō [key], city, capital of Pasco dept., central...

Martin, Archer John Porter

(Encyclopedia)Martin, Archer John Porter, 1910–2002, English biochemist, educated at Cambridge. From 1938 to 1946 he carried on chemical research in the laboratories of the Wool Industries Association at Leeds, Y...

Nogales

(Encyclopedia)Nogales nōgäˈlās [key], city (1990 pop. 19,489), Santa Cruz co., S Ariz. on the Mexican border with its adjacent city, Nogales (1990 pop. 105,873), Sonora, NW Mexico. There are copper, silver, and...

Tarsus

(Encyclopedia)Tarsus tärˈsəs, Turk. tärso͝osˈ [key], city (1990 pop. 191,333), S Turkey, in Cilicia, on the Tarsus (anc. Cydnus) River, near the Mediterranean Sea. It is an agricultural trade center; copper, ...

Helsingborg

(Encyclopedia)Helsingborg or Hälsingborg both: hĕlsĭngbôrˈyə [key], city, Malmöhus co., S Sweden...

iron

(Encyclopedia)iron, metallic chemical element; symbol Fe [Lat. ferrum]; at. no. 26; at. wt. 55.845; m.p. about 1,535℃; b.p. about 2,750℃; sp. gr. 7.87 at 20℃; valence +2, +3, +4, or +6. Iron is biologically s...