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DK Earth: Human Impact

HOW DOES FARMING CHANGE THE LANDSCAPE? HOW DOES INDUSTRY AFFECT THE LANDSCAPE? WHAT CHALLENGES FACE THE HUMAN POPULATION? POLLUTIONGLOBAL WARMINGFIND OUT MOREOver six billion people live on planet…

chromatography

(Encyclopedia) chromatographychromatographykrōˌmətŏgˈrəfē [key], resolution of a chemical mixture into its component compounds by passing it through a system that retards each compound to a varying…

Martin Luther King, Jr., Biography

1929—1968, American clergyman and civil rights leader   Dr. Martin Luther King, Jr., prepares to speak to a crowd of 200,000 marchers in Washingtion, DC. Related Links…

Economy 101

The vocabulary of recession   Related Links Currency Quiz A Brief History of U.S. Banking Budgets What Is the Stock Market? Nobel Prize for Economics…

March 2008 Current Events

Here are the key news events of the month organized into three categories: World News, U.S. News, and Business, Society, and Science News. World | Nation | Business/…

latitude

(Encyclopedia) latitude, angular distance of any point on the surface of the earth north or south of the equator. The equator is latitude 0°, and the North Pole and South Pole are latitudes 90°N and…

stratosphere

(Encyclopedia) stratospherestratospherestrătˈəsfēr [key], second lowest layer of the earth's atmosphere. The level from which it extends outward varies with latitude; it begins c.51&fslsh;2 mi (9…

Van Allen radiation belts

(Encyclopedia) CE5 Van Allen radiation belts: The solar wind, a stream of protons, electrons, and ions coming from the sun, gives the belts their asymmetrical shape. Van Allen radiation belts,…

vapor pressure

(Encyclopedia) vapor pressure, pressure exerted by a vapor that is in equilibrium with its liquid. A liquid standing in a sealed beaker is actually a dynamic system: some molecules of the liquid are…