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immigration

(Encyclopedia)immigration, entrance of a person (an alien) into a new country for the purpose of establishing permanent residence. Motives for immigration, like those for migration generally, are often economic, al...

exploration

(Encyclopedia)exploration, travel to a part of the earth that is relatively unknown to the traveler's culture, historically often motivated by a desire for colonization, conquest, or trade. See also space explorati...

copper, chemical element

(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...

mountain

(Encyclopedia)mountain, high land mass projecting conspicuously above its surroundings and usually of limited width at its summit. Although isolated mountains are not unusual, mountains commonly form ranges, compri...

capital punishment

(Encyclopedia)capital punishment, imposition of a penalty of death by the state. Since the 1970s almost all capital sentences in the United States have been imposed for homicide. There has been intense debate reg...

Colorado, state, United States

(Encyclopedia)CE5 Colorado kŏlərădˈə, –rădˈō, –räˈdō [key], state, W central United States, one of the Rocky Mt. states. It is bordered by Wyoming (N), Nebraska (N, E), Kansas (E), Oklahoma and Ne...

Oregon, state, United States

(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...

Andes

(Encyclopedia)Andes ănˈdēz [key], mountain system, more than 5,000 mi (8,000 km) long, W South America. The ranges run generally parallel to the Pacific coast and extend from Tierra del Fuego northward, across t...

wolf

(Encyclopedia)wolf, carnivorous mammal of the genus Canis in the dog family. Once distributed over most of the Northern Hemisphere, wild wolves are now confined to the wilder parts of a reduced range. Three wolf sp...

Wyoming, state, United States

(Encyclopedia)CE5 Wyoming wīōˈmĭng [key], least populous state in the United States, one of the Rocky Mt. states of the West. It is bordered by South Dakota and Nebraska (E), Colorado and Utah (S), Idaho (W)...