The Atlantic Ocean is saltier than the Pacific Ocean.
54
The Dallas/Ft. Worth airport is larger than New York City's Manhattan Island.
62
An earthquake on Dec. 16, 1811 caused parts of the Mississippi River to flow backwards.
243
In one day, a full grown redwood tree expels more than 2 tons of water through its leaves.
56
The Sahara desert expands at about 1km per month.
90
The water of the Antarctica is so cold that nothing can rot there.
334
The Amazon rainforest produces more than 20% the world's oxygen supply.
182
There's a lake under Antarctica that is 25 million years old called Lake Vostok.
109