Columbia Encyclopedia

(Encyclopedia) Pleistocene epoch plīˈstəsēn [key], 6th epoch of the Cenozoic era of geologic time (see Geologic Timescale, tablegeologic timescale, table). According to a classification that considered its depos...

(Encyclopedia) copper, metallic chemical element; symbol Cu [Lat. cuprum=copper]; at. no. 29; at. wt. 63.546; m.p. 1,083.4℃; b.p. 2,567℃; sp. gr. 8.96 at 20℃; valence +1 or +2. Copper and some of its alloys ha...

(Encyclopedia) prostitution, act of granting sexual access for payment. Although most commonly conducted by females for males, it may be performed by females or males for either females or males. Prostitution in A...

(Encyclopedia) Tonga tŏngˈgə [key], officially Kingdom of Tonga, island kingdom (2015 est. pop. 106,000), 270 sq mi (699 sq km), South Pacific, c.2000 mi (3,220 km) NE of Sydney, Australia. Tonga is the only surv...

(Encyclopedia)  CE5 Utah yo͞oˈtäˌ [key], Rocky Mt. state of the W United States. It is bordered by Idaho and Wyoming (N), Colorado (E), Arizona (S), and Nevada (W), and touches New Mexico in the SE, at the Fou...

(Encyclopedia) Cretaceous period krĭtāˈshəs [key], third and last period of the Mesozoic era of geologic time (see Geologic Timescale, tablegeologic timescale, table), lasting from approximately 144 to 65 millio...

(Encyclopedia) Native American languages, languages of the native peoples of the Western Hemisphere and their descendants. A number of the Native American languages that were spoken at the time of the European arriv...

(Encyclopedia) disarmament, nuclear, the reduction and limitation of the various nuclear weapons in the military forces of the world's nations. The atomic bombs dropped (1945) on Japan by the United States in World ...

(Encyclopedia)  CE5 Idaho īˈdəhō [key], one of the Rocky Mt. states in the NW United States. It is bordered by Montana and Wyoming (E), Utah and Nevada (S), Oregon and Washington (W), and the Canadian province...

(Encyclopedia)  CE5 Oregon ŏrˈĭgən, –gŏn [key], state in the Pacific Northwest of the United States. It is bordered by Washington, largely across the Columbia River (N), Idaho, partially across the Snake Ri...