The longest cave in the world is the 'Mammoth Cave System' in the USA at 560,000 mtrs deep!
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Israel's Dead Sea is 1,312 feet below sea level.
48
The Niagara Falls moves upstream at an average rate of about 295ft a century!
48
A volcano has enough power to shoot ash as high as 50 km into the atmosphere.
59
Mexico City is built on top of an underground resevoir!
47
The state of Florida is bigger than England!
74
An earthquake on Dec. 16, 1811 caused parts of the Mississippi River to flow backwards.
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