Mexico City is built on top of an underground resevoir!
47
Australia's Great Barrier Reef is 1,250 miles long!
45
Louisiana is the only state that grows in land area every year (Due to alluvial deposits from the Mississippi River).
41
More than a dozen men have stood on the surface of the moon, but only three have been to Challenger Deep in the Marianas Trench, the deepest known spot in the ocean.
17
An earthquake on Dec. 16, 1811 caused parts of the Mississippi River to flow backwards.
243
Check your map! The Pacific entrance of the Panama Canal is farther East than the Atlantic entrance.
40
The city of Houston, Texas is built on a swamp and is slowly sinking!
89
The average ice berg weighs 20,000,000 tons!
54