One cubic mile of seawater contains about 50 pounds of gold.
79
Australia's Great Barrier Reef is 1,250 miles long!
45
Forest fires move faster uphill than downhill.
52
Mexico City is built on top of an underground resevoir!
47
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 state of Florida is bigger than England!
74