The longest cave in the world is the 'Mammoth Cave System' in the USA at 560,000 mtrs deep!
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There are more than 50,000 earthquakes throughout the world every year!
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The average ice berg weighs 20,000,000 tons!
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An earthquake on Dec. 16, 1811 caused parts of the Mississippi River to flow backwards.
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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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Europe is the only continent without a desert.
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The Niagara Falls moves upstream at an average rate of about 295ft a century!
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