* The Dallas/Ft. Worth airport is larger than New York City's Manhattan Island. *
* The longest cave in the world is the 'Mammoth Cave System' in the USA at 560,000 mtrs deep! *
* The Niagara Falls moves upstream at an average rate of about 295ft a century! *
* The state of Florida is bigger than England! *
* The state with the longest coastline in the Continent of North America is Michigan. *
* The average ice berg weighs 20,000,000 tons! *
* Mexico City is built on top of an underground resevoir! *
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