Mexico City is built on top of an underground resevoir!
47
If Antarctica's ice sheets melted, the worlds oceans would rise by 60 to 65 metres (200 - 210ft) - everywhere
181
The city of Houston, Texas is built on a swamp and is slowly sinking!
89
An earthquake on Dec. 16, 1811 caused parts of the Mississippi River to flow backwards.
243
The state of Florida is bigger than England!
74
Forest fires move faster uphill than downhill.
52
The longest cave in the world is the 'Mammoth Cave System' in the USA at 560,000 mtrs deep!
63