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10 Longest Rivers in the U.S.: From the Missouri to the Brazos

science.howstuffworks.com/environmental/earth/geophysics/longest-river-in-the-us.htm

We bet you're looking up the longest river in the U.S. to settle a bet: Is it the Missouri River or the Mississippi River? It depends how you measure.

The North American Geography Knowledge Quiz

play.howstuffworks.com/quiz/the-north-american-geography-knowledge-quiz

From just north of the Equator to just south of the North Pole, this quiz covers North America's highs, lows and everything in between. See if you can scale this mountain of a geography quiz and reach the peak!

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