There are approximately three chickens for every human on Earth.
13
An earthquake on Dec. 16, 1811 caused parts of the Mississippi River to flow backwards.
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The longest cave in the world is the 'Mammoth Cave System' in the USA at 560,000 mtrs deep!
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Australia's Great Barrier Reef is 1,250 miles long!
45
Mexico City is built on top of an underground resevoir!
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The Niagara Falls moves upstream at an average rate of about 295ft a century!
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It takes a drop of ocean water more than 1,000 years to circulate around the world.
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