A waterfall known as The Devil's Kettle empties water into a hole and nobody knows where it ends up!
18
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
An earthquake on Dec. 16, 1811 caused parts of the Mississippi River to flow backwards.
243
More than 25% of the world's forests are in Siberia.
51
Every year, Alaska has about 5,000 earthquakes.
31
The average ice berg weighs 20,000,000 tons!
54