An earthquake on Dec. 16, 1811 caused parts of the Mississippi River to flow backwards.
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Mexico City is built on top of an underground resevoir!
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Due to gravitational effects, you weigh slightly less when the moon is directly overhead.
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Venice Island was built on a foundation of tree trunks. 1200 years later, those same trunks still support almost all of central Venice.
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One cubic mile of seawater contains about 50 pounds of gold.
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The Caspian Sea is also classed as the world's largest lake.
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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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Every year, Alaska has about 5,000 earthquakes.
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