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tantalum

(Encyclopedia)tantalum tănˈtələm [key] [from Tantalus], metallic chemical element; symbol Ta; at. no. 73; at. wt. 180.94788; m.p. 2,996℃; b.p. 5,400±100℃; sp. gr. 16.65 at 20℃; valence +2, +3, +4, or +5....

Kyakhta

(Encyclopedia)Kyakhta or Kiakhta both: kyäkhˈtə [key], city, Buryat Republic, S Siberian Russia, near the Russian-Mongolian border. Kyakhta is on the highway from Ulan-Ude to Ulaanbaatar and is a major transit p...

The Pas

(Encyclopedia)The Pas päz, pä [key], town (1991 pop. 6,166), W Man., Canada, on the Saskatchewan River. Founded as a fur-trading post, it became in 1920 the starting point and headquarters of the Hudson Bay Railw...

Thayer, Sylvanus

(Encyclopedia)Thayer, Sylvanus, 1785–1872, American soldier and educator, b. Braintree, Mass., grad. Dartmouth, 1807, and West Point, 1808. During the War of 1812 he served as an engineer, and afterward he was se...

Barrow, city, United States

(Encyclopedia)Barrow, city (2020 pop. 4,390), N Alaska; inc. 1958. It is the northernmost (71° 16′ N) U.S. settlement and the trade center of the Alaska North Slop...

quadrature

(Encyclopedia)quadrature, in astronomy, arrangement of two celestial bodies at right angles to each other as viewed from a reference point. If the reference point is the earth and the sun is one of the bodies, a pl...

North Cape

(Encyclopedia)North Cape or Nordkapp nōrˈkäp [key], promontory, rising steeply c.1,000 ft (300 m) from the Arctic Ocean, near but not at the north end of Magerøya island, Finnmark co., N Norway. Although Mager�...

osteoporosis

(Encyclopedia)osteoporosis ŏsˌtēōˌpərōˈsĭs [key], disorder in which the normal replenishment of old bone tissue is severely disrupted, resulting in weakened bones and increased risk of fracture; osteopenia...

boron

(Encyclopedia)boron bōrˈŏn [key] [New Gr. from borax], chemical element; symbol B; at. no. 5; interval in which at. wt. ranges 10.806–10.821; m.p. about 2,300℃; sublimation point about 2,550℃; sp. gr. 2.3 ...

Lookout, Cape

(Encyclopedia)Lookout, Cape, point of a sandy reef (Core Banks), off E N.C., SW of Cape Hatteras. The reef guards the port entrance to Beaufort and Morehead City. A lighthouse on the point was built in 1859 and is ...