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    • Noise pollution Featured Article Noise pollution Noise pollution

      Noise pollution is unwanted or harmful sound that intrudes upon human or other faunal activity. Noise pollution is almost entirely human generated, whether by machine sources or... More »

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Estonia Last Updated on 2012-05-20 at 19:27 Estonia is a nation of just under one-and-a-third million people in Eastern Europe, bordering the Baltic Sea and Gulf of Finland, between Latvia and Russia. The... More »
Noise pollution Last Updated on 2011-11-03 at 09:55 Noise pollution is unwanted or harmful sound that intrudes upon human or other faunal activity. Noise pollution is almost entirely human generated, whether by machine sources or... More »
Hallidie, Andrew Smith Last Updated on 2011-10-16 at 13:20 Andrew Smith Hallidie (1836-1900), the English-born American designer and builder of the first municipal cable car system (cable railroad) in San Francisco, California.... More »
Roads, highways, and ecosystems Last Updated on 2011-08-10 at 10:51 Lead Author: John Stilgoe (other articles)Content Partners: National Humanities Center (other articles) and TeacherServe More »
Bering Strait Last Updated on 2011-05-13 at 13:22 The Bering Strait is a narrow ocean passage separating the North American and Asian continents.With Cape Prince of Wales on the Seward Peninsula of Alaska to the east, and Cape... More »
Pollution Last Updated on 2010-12-31 at 09:26 Pollution is environmental contamination that results in harm or death to living organisms. Most pollution is in the form of chemical additions to air, water or soil; however, in... More »
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