The Amazon rainforest produces more than 20% the world's oxygen supply.
182
The average ice berg weighs 20,000,000 tons!
54
One cubic mile of seawater contains about 50 pounds of gold.
79
An earthquake on Dec. 16, 1811 caused parts of the Mississippi River to flow backwards.
243
The city of Houston, Texas is built on a swamp and is slowly sinking!
89
Israel's Dead Sea is 1,312 feet below sea level.
48
Europe is the only continent without a desert.
62