The city of Houston, Texas is built on a swamp and is slowly sinking!
89
The Sahara desert expands at about 1km per month.
90
An earthquake on Dec. 16, 1811 caused parts of the Mississippi River to flow backwards.
243
There's a lake under Antarctica that is 25 million years old called Lake Vostok.
109
A volcano has enough power to shoot ash as high as 50 km into the atmosphere.
59
The longest cave in the world is the 'Mammoth Cave System' in the USA at 560,000 mtrs deep!
63
It's still possible to see the division between East and West Germany due to different light bulbs.
5
Forest fires move faster uphill than downhill.
52