An earthquake on Dec. 16, 1811 caused parts of the Mississippi River to flow backwards.
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Every year, Alaska has about 5,000 earthquakes.
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Due to gravitational effects, you weigh slightly less when the moon is directly overhead.
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10 of the tributaries flowing into the Amazon river are as big as the Mississippi river.
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There are more than 50,000 earthquakes throughout the world every year!
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Israel's Dead Sea is 1,312 feet below sea level.
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