Mexico City is built on top of an underground resevoir!
47
Australia's Great Barrier Reef is 1,250 miles long!
45
Venice Island was built on a foundation of tree trunks. 1200 years later, those same trunks still support almost all of central Venice.
8
There are more than 50,000 earthquakes throughout the world every year!
47
The warmest temperature ever recorded on Antarctica was 3 degrees F.
175
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