An earthquake on Dec. 16, 1811 caused parts of the Mississippi River to flow backwards.
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Australia's Great Barrier Reef is 1,250 miles long!
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Mexico City is built on top of an underground resevoir!
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Israel's Dead Sea is 1,312 feet below sea level.
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The Caspian Sea is also classed as the world's largest lake.
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Due to gravitational effects, you weigh slightly less when the moon is directly overhead.
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Forest growth in the US has exceeded harvest since the 1940’s. Today, we have more trees than any time in the past 100 years.
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More than a dozen men have stood on the surface of the moon, but only three have been to Challenger Deep in the Marianas Trench, the deepest known spot in the ocean.
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