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
The Amazon rainforest produces more than 20% the world's oxygen supply.
182
The Dallas/Ft. Worth airport is larger than New York City's Manhattan Island.
62
There's a lake under Antarctica that is 25 million years old called Lake Vostok.
109
The warmest temperature ever recorded on Antarctica was 3 degrees F.
175
The Niagara Falls moves upstream at an average rate of about 295ft a century!
48