Forest fires move faster uphill than downhill.
52
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
There's a lake under Antarctica that is 25 million years old called Lake Vostok.
109
The Dallas/Ft. Worth airport is larger than New York City's Manhattan Island.
62
It takes a drop of ocean water more than 1,000 years to circulate around the world.
61