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America's Ten Most Endangered Rivers, 2011

Each year the organization American Rivers analyzes the condition of the nation's rivers to determine which are the most “endangered.” Threats to these rivers include dams and channelizations that…

Major Chemical and Nuclear Disasters

Accidents happen, but when they destroy the delicate balance of nature or cause a large number of people to suffer, they become disasters. Here are some of the largest disasters that have been…

dentistry

(Encyclopedia) dentistry, treatment and care of the teeth and associated oral structures. Dentistry is mainly concerned with tooth decay, disease of the supporting structures, such as the gums, and…

water pollution

(Encyclopedia) water pollution, contamination of water resources by harmful wastes; see also sewerage, water supply, pollution, and environmentalism. The United States has enacted extensive federal…

Weather Words

Air pressure: Air has weight. Air pressure is the weight of the air, or atmosphere, pushing down on Earth. The closer you are to sea level, the higher the air pressure because there’s that…

Birmingham, city, England

(Encyclopedia) Birmingham Birmingham bûrˈmĭngəm [key], city and metropolitan borough (2021 city pop. 2,606,374…