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metal
(Encyclopedia)metal, chemical element displaying certain properties by which it is normally distinguished from a nonmetal, notably its metallic luster, the capacity to lose electrons and form a positive ion, and th...Guangdong
(Encyclopedia)Guangdong or Kwangtung both: gwängˈdo͝ongˈ [key], province, c.76,000 sq mi (196,891 s...thorium
(Encyclopedia)thorium thôrˈēəm [key] [from Thor], radioactive chemical element; symbol Th; at. no. 90; mass number of most stable isotope 232; m.p. about 1,750℃; b.p. about 4,790℃; sp. gr. 11.7 at 20℃; va...Urals
(Encyclopedia)Urals or Ural Mountains, E European Russia and NW Kazakhstan, forming, together with the Ural River, the traditional boundary between Europe and Asia and separating the Russian plain from the W Siberi...X ray
(Encyclopedia) CE5 Typical X-ray composite spectrum (intensity as a function of frequency) X ray, invisible, highly penetrating electromagnetic radiation of much shorter wavelength (higher frequency) than visibl...Northwest Territories
(Encyclopedia) CE5 Northwest Territories, territory (2001 pop. 37,360), 532,643 sq mi (1,379,028 sq km), NW Canada. The Northwest Territories lie W of Nunavut, N of lat. 60°N, and E of Yukon. Until 1999, when th...carbon
(Encyclopedia) CE5 The three solid forms of pure carbon: In the diamond crystal each carbon atom is surrounded symmetrically by four other carbons (at each of the four corners of a tetrahedron). In the graphite c...Tajikistan
(Encyclopedia) CE5 Tajikistan təjĭkĭstänˈ [key], officially Republic of Tajikistan, republic (2015 est. pop. 8,192,000), 55,251 sq mi (143,100 sq km), central Asia. It borders on China in the east, Afghanist...Mongolia, country, Asia
(Encyclopedia) CE5 Mongolia mŏn-gōˈlēə, mŏng– [key], republic (2015 est. pop. 2,977,000), 604,247 sq mi (1,565,000 sq km), N central Asia; historically known as Outer Mongolia. Bordered on the west, south...Korea
(Encyclopedia) CE5 Korea kôrēˈə, kə– [key], Korean Hanguk or Choson, region and historic country (85,049 sq mi/220,277 sq km), E Asia. A peninsula, 600 mi (966 km) long, Korea separates the Sea of Japan (c...Browse by Subject
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