(Encyclopedia) graphitegraphitegrăfˈīt [key], an allotropic form of carbon, known also as plumbago and black lead. It is dark gray or black, crystalline (often in the form of slippery scales), greasy…
(Encyclopedia) Perelman, Grigori Yakovlevich, 1966–, Russian mathematician. After doing graduate work in the late 1980s for his Candidate of Science degree from Leningrad State Univ. (now St.…
(Encyclopedia) Potteries, the, area, c.9 mi (15 km) long and 3 mi (4.8 km) wide, Staffordshire, W central England, extending northwest-southeast in the upper Trent valley. The area includes Stoke-on-…
(Encyclopedia) slate, fine-grained rock formed when sedimentary rocks such as shale are metamorphosed by great pressure. Slate splits into perfectly cleaved, broad thin layers; this…
(Encyclopedia) stratification (Lat.,=made in layers), layered structure formed by the deposition of sedimentary rocks. Changes between strata are interpreted as the result of fluctuations in the…
(Encyclopedia) sunbittern, common name for a graceful, stout-bodied, bitternlike bird, Eurypyga helias. It is named for its wing markings, an orange-chestnut shield set in an orange-buff circle,…
(Encyclopedia) Zanesville, city (1990 pop. 26,778), seat of Muskingum co., central Ohio, on the Muskingum River at its junction with the Licking River; inc. 1815. It is a trade and industrial center…
(Encyclopedia) Black, Hugo LaFayette, 1886–1971, associate justice of the U.S. Supreme Court (1937–71), b. Harlan, Clay co., Ala. He received his law degree from the Univ. of Alabama in 1906. He…
(Encyclopedia) bull-roarer, an instrument consisting of slit board or chamber attached to a cord. When swung around in the air, it emits a deep, vibrant, “whirrrrrr”-like sound. The mythology of some…
