Columbia Encyclopedia
Search results
88 results found
polonium
(Encyclopedia)polonium pəlōˈnēəm [key], radioactive chemical element; symbol Po; at. no. 84; mass no. of most stable isotope 209; m.p. 254℃; b.p. 962℃; sp. gr. about 9.4; valence +2 or +4. Polonium is an e...Cyrene
(Encyclopedia)Cyrene sīrēˈnē [key], ancient city near the northern coast of Africa, in Cyrenaica (now E Libya). It was a Greek colony founded (c.630 b.c.) by Aristoteles of Thera, who became king of Cyrene as B...Chinese Dynasties (table)
(Encyclopedia)Chinese Dynastiesretrograde motion
(Encyclopedia)retrograde motion, in astronomy, real or apparent movement of a planet, dwarf planet, moon, asteroid, or comet from east to west relative to the fixed stars. The most common direction of motion in the...Equatorial Guinea
(Encyclopedia)CE5 Equatorial Guinea gĭnˈē [key], officially Republic of Equatorial Guinea, republic (2021 est. pop. ...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...Piedmont, region, Italy
(Encyclopedia)Piedmont pēdˈmŏnt [key], Ital. Piemonte, region (1991 pop. 4,302,565), 9,807 sq mi (25,400 sq km), NW Italy, bordering on France in the west and on Switzerland in the north. Turin is the capital of...Venetia
(Encyclopedia)Venetia vənēˈshə [key], Ital. Veneto or Venezia Euganea, region (1991 pop. 4,380,797), 7,095 sq mi (18,376 sq km), NE Italy, bordering on the Gulf of Venice (an arm of the Adriatic Sea) in the eas...Mediterranean Sea
(Encyclopedia)CE5 Mediterranean Sea [Lat.,=in the midst of lands], the world's largest inland sea, c.965,000 sq mi (2,499,350 sq km), surrounded by Europe, Asia, and Africa. Some of the most ancient civilizat...Genoa
(Encyclopedia)Genoa jĕnˈōwə [key], Ital. Genova, city, capital of Genoa prov. and of Liguria, NW Italy,...Browse by Subject
- Earth and the Environment +-
- History +-
- Literature and the Arts +-
- Medicine +-
- People +-
- Philosophy and Religion +-
- Places +-
- Africa
- Asia
- Australia and Oceania
- Britain, Ireland, France, and the Low Countries
- Commonwealth of Independent States and the Baltic Nations
- Germany, Scandinavia, and Central Europe
- Latin America and the Caribbean
- Oceans, Continents, and Polar Regions
- Spain, Portugal, Italy, Greece, and the Balkans
- United States, Canada, and Greenland
- Plants and Animals +-
- Science and Technology +-
- Social Sciences and the Law +-
- Sports and Everyday Life +-
