Columbia Encyclopedia

(Encyclopedia)  CE5 Nevada nəvădˈə, –vä– [key], far western state of the United States. It is bordered by Utah (E), Arizona (SE), California (SW, W), and Oregon and Idaho (N). In the 20th cent. the ...

(Encyclopedia) air pollution, contamination of the air by noxious gases and minute particles of solid and liquid matter (particulates) in concentrations that endanger health. The major sources of air pollution are t...

(Encyclopedia)  CE5 Tajikistan təjĭkĭstänˈ [key], officially Republic of Tajikistan, republic (2015 est. pop. 8,192,000), 55,251 sq mi (143,100 sq km), central Asia. It borders on China in the east, Afghanist...

(Encyclopedia) chemistry, branch of science concerned with the properties, composition, and structure of substances and the changes they undergo when they combine or react under specified conditions. Organic chemi...

(Encyclopedia) medicine, the science and art of treating and preventing disease. Modern medicine, characterized by growing specialization and a complex diagnostic and therapeutic technology, faces problems in the...

(Encyclopedia) periodical, a publication that is issued regularly. It is distinguished from the newspaper in format in that its pages are smaller and are usually bound, and it is published at weekly, monthly, quarte...

(Encyclopedia)  CE5 Iowa īˈəwə [key], midwestern state in the N central United States. It is bounded by the Mississippi River, across which lie Wisconsin and Illinois (E); Missouri (S); Nebraska and South Dako...

(Encyclopedia) newspaper, publication issued periodically, usually daily or weekly, to convey information and opinion about current events. In England large newspaper-publishing empires were built up by Lords...

(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) Elements 1 Parentheses indicate most stable isotope; brackets enclose lower and upper bounds of weight variation. ...