Columbia Encyclopedia

(Encyclopedia) Agassiz, Lake ăgˈəsē [key], glacial lake of the Pleistocene epoch, c.700 mi (1,130 km) long, 250 mi (400 km) wide, formed by the melting of the continental ice sheet beginning some 14,000 years ag...

(Encyclopedia) agate ăgˈĭt [key], translucent, cryptocrystalline variety of quartz and a subvariety of chalcedony. Agates are identical in chemical structure to jasper, flint, chert, petrified wood, and tiger's-e...

(Encyclopedia) Eggleston, William (William Joseph Eggleston, Jr.), 1939–, American photographer credited with establishing color photography as an art form, b. Memphis Tenn. His early work in black and white was i...

(Encyclopedia) amphitheater ămˈfəthēˌətər, ămˈpə– [key], open structure used for the exhibition of gladiatorial contests, struggles of wild beasts, sham sea battles, and similar spectacles. There is no G...

(Encyclopedia) Persian art and architecture, works of art and structures produced in the region of Asia traditionally known as Persia and now called Iran. Bounded by fierce mountains and deserts, the high plateau of...

(Encyclopedia) Saramago, José zho͞ozĕˈ särˌämäˈgo͞o [key], 1922–2010, Portuguese novelist and short-story writer. He became a member of the Communist party in 1969 and was a staunch atheist and a strong ...

(Encyclopedia) Badakhshan bädäkhshänˈ, bədəkhshänˈ [key], province (1979 est. pop. 497,000), 17,011 sq mi (44,059 sq km), extreme NE Afghanistan, between the Hindu Kush Mts. and the Amu Darya River. The capi...

(Encyclopedia) Portsmouth, city and unitary authority (2011 pop. 205,056), S England, on Spithead Channel. The city includes Portsea (naval station), Southsea (residential district and resort), and the old town of P...

(Encyclopedia) chipmunk, rodent of the family Sciuridae (squirrel family). The chipmunk of the E United States and SE Canada is of the genus Tamias. The body of the common Eastern chipmunk, Tamias striatus, is about...

(Encyclopedia) jade, common name for either of two minerals used as gems. The rarer variety of jade is jadeite, a sodium aluminum silicate, NaAl(SiO3)2, usually white or green in color; the green variety is the more...