Mexico City is built on top of an underground resevoir!
47
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
Due to gravitational effects, you weigh slightly less when the moon is directly overhead.
55
The warmest temperature ever recorded on Antarctica was 3 degrees F.
175
It takes a drop of ocean water more than 1,000 years to circulate around the world.
61