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silver
(Encyclopedia)silver, metallic chemical element; symbol Ag [Lat. argentum]; at. no. 47; at. wt. 107.8682; m.p. 961.93℃; b.p. 2,212℃; sp. gr. 10.5 at 20℃; valence +1 or +2. Pure silver is nearly white, lustrou...free silver
(Encyclopedia)free silver, in U.S. history, term designating the political movement for the unlimited coinage of silver. In 1896 free silver became the major issue of a presidential campaign when William Jennings...Jurassic period
(Encyclopedia)Jurassic period jərăsˈĭk [key] [from the Jura Mts.], second period of the Mesozoic era of geologic time, lasting from 213 to 144 million years ago. At the start of the Jurassic most of the contine...Triassic period
(Encyclopedia)Triassic period trīăsˈĭk [key], first period of the Mesozoic era of geologic time (see Geologic Timescale, tablegeologic timescale, table) from 205 to 250 million years ago. Throughout the Triassi...gold
(Encyclopedia)gold, metallic chemical element; symbol Au [Lat. aurum=shining dawn]; at. no. 79; at. wt. 196.96657; m.p. 1,064.43℃; b.p. 2,808℃; sp. gr. 19.32 at 20℃; valence +1 or +3. Gold is very ductile and...Andalusia, region, Spain
(Encyclopedia)Andalusia änˌdälo͞othēˈä [key], autonomous community, 33,821 sq mi (87,596 sq km), S Spain, on the Mediterranean Sea, the Strait of Gibraltar, and the Atlantic Ocea...Colorado, rivers, United States and Mexico
(Encyclopedia)Colorado [1] kŏlərădˈə, –rădˈō, –räˈdō [2] kŏlərāˈdə, –räˈdə [key]. 1 Great river of the SW United States, 1,450 mi (2,334 km) long, rising in the Rocky Mts. of N Colo., and f...mummy
(Encyclopedia)mummy, dead human or animal body preserved by embalming or by unusual natural conditions. As a rule mummies are from ancient times. The word is of Arabic derivation and refers primarily to the burials...California
(Encyclopedia) CE5 California kălˌĭfôrˈnyə [key], most populous state in the United States, located in the Far West; bordered by Oregon (N), Nevada and, across the Colorado River, Arizona (E), Mexico (S), a...mountain climbing
(Encyclopedia)mountain climbing, the practice of climbing to elevated points for sport, pleasure, or research. Also called mountaineering, it is practiced throughout the world. Many mountain climbing clubs have...Browse by Subject
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