(Encyclopedia) Allegheny Plateau, dissected plateau, western part of the Appalachian Mts., extending c.500 mi (800 km) SW from N Pa. to SW Va., rising to c.4,860 ft (1,480 m) at Spruce Knob, the…
(Encyclopedia) chalcopyritechalcopyritekălˌkəpīˈrīt, kălˈkōpīˌrīt [key] or copper pyriteschalcopyritepīrīˈtēz, pə– [key], brass-yellow mineral, sometimes with an iridescent tarnish. It is a sulfide…
(Encyclopedia) Port of Spain, city (1990 pop. 50,878), capital of Trinidad and Tobago, on the Gulf of Paria. It is the industrial and commercial center of the country. From 1958 to 1962, Port of…
(Encyclopedia) VilyuiVilyuivĭly&oomacr;ˈē [key], river, c.1,520 mi (2,450 km) long, rising in the central Siberian uplands, E Siberian Russia, in the Sakha Republic, and flowing east through an…
(Encyclopedia) cerussitecerussitesērˈəsīt [key], colorless to white or gray mineral, sometimes yellowish or greenish, transparent to opaque, very brittle, crystallizing in the orthorhombic system and…
(Encyclopedia) molybdenitemolybdeniteməlĭbˈdənīt, mō– [key], a mineral, molybdenum disulfide, MoS2, blue-gray in color, with a metallic luster and greasy feel. It occurs in crystals of the hexagonal…
(Encyclopedia) LuleåLuleålüˈləōˌ [key], city (1990 pop. 42,730), capital of Norrbotten co., NE Sweden, a port on the Gulf of Bothnia at the mouth of the Luleälv River. Although its harbor is icebound…
(Encyclopedia) NarvikNarviknärˈvĭk [key], city (1995 pop. 18,899), Nordland co., N Norway, an ice-free port on the Ofotfjord opposite the Lofoten Islands. It was founded (1887) as the Atlantic port…
