In the early 1900s, most geologists thought that Earth's appearance, including the arrangement of the continents, had changed little since its formation. This video segment describes the impact the theory of plate...
Fueled by economic pressure to maximize crop yields and government incentives to produce only one type of crop, contemporary American farmers have been facing a crisis reminiscent of one that hit the Great Plains in the...
When Mount St. Helens erupted on May 18, 1980, the top 400 meters (1,300 feet) of the volcano disappeared in a blast that covered more than 390 square kilometers (150 square miles) and sent thousands of tons of ash into...
This animated visualization from the National Aeronautics and Space Administration (NASA) shows the monthly distribution of global rainfall from January 1979 to January 2001, as illustrated by data gathered with a...
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