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glacial periods
(Encyclopedia)glacial periods, times during which large portions of the earth's surface were covered with thick glacial ice sheets. In the Pleistocene epoch, in the Carboniferous and Permian periods of the Paleozoi...lithium
(Encyclopedia)lithium lĭthˈēəm [key] [Gr.,=stone], metallic chemical element; symbol Li; at. no. 3; interval in which at. wt. ranges 6.938–6.997; m.p. about 180.54℃; b.p. about 1,342℃; sp. gr. .534 at 20...Mezzogiorno
(Encyclopedia)Mezzogiorno mĕtˌsōjôrˈnō [key], region of S Italy. The Mezzogiorno comprises the modern Italian regions of Abruzzi, Campania, Molise, Puglia, Basilicata, Calabria, and the islands of Sicily and ...Deng Xiaoping
(Encyclopedia)Deng Xiaoping or Teng Hsiao-p'ing both: dŭngˈ shouˈpĭngˈ [key], 1904–97, Chinese revolutionary and government leader, b. Sichuan prov. Deng became a member of the Chinese Communist party while ...binary star
(Encyclopedia) CE5 A. Eclipsing binary: Primary component passing behind secondary (dimmer) component B. Light curve for eclipsing binary binary star or binary system, pair of stars that are held together by the...sea level
(Encyclopedia)sea level, the level of the sea, which serves as the datum used for measurement of land elevations and ocean depths. Theoretically, one would expect sea level to be a fixed and permanent horizontal su...scarab beetle
(Encyclopedia)scarab beetle or scarab, name for members of a large family of heavy-bodied, oval beetles (the Scarabaeidae), with about 30,000 species distributed throughout most of the world and over 1,200 in North...Stoppard, Tom
(Encyclopedia)Stoppard, Tom, 1937–, English playwright, b. Zlín, Czechoslovakia (now in the Czech Republic), as Tomas Straussler. During his childhood he and his family moved to Singapore, later (1946) settling ...ozone layer
(Encyclopedia)ozone layer or ozonosphere, region of the stratosphere containing relatively high concentrations of ozone, located at altitudes of 12–30 mi (19–48 km) above the earth's surface. Ozone in the ozone...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...Browse by Subject
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