Tornado Quick Facts | cnn

cnn — The following is general information about tornadoes, rotating columns of air that are often, but not always, visible…

Quick Facts about Volcanoes | cnn

cnn — Here's a look at volcanoes, mountains that open into a deposit of molten rock. More than 80% of…

Lake Powell's total capacity is shrinking, report shows

cnn — Lake Powell, the second-largest man-made reservoir in the U.S., has lost nearly 7% of its potential storage capacity…

Basic data on strategic oil reserves

cnn — Here's a look at what you need to know about the U.S. Strategic Petroleum Reserve. The United States…