One cubic mile of seawater contains about 50 pounds of gold.
79
There's a lake under Antarctica that is 25 million years old called Lake Vostok.
109
The state with the longest coastline in the Continental U.S. is Michigan.
31
10 of the tributaries flowing into the Amazon river are as big as the Mississippi river.
41
An earthquake on Dec. 16, 1811 caused parts of the Mississippi River to flow backwards.
243
The Amazon rainforest produces more than 20% the world's oxygen supply.
182
The water between India and Sri Lanka is only 3-30 feet deep and was purportedly passable on foot until 1480 AD when a cyclone moved some sand around.
1