One cubic mile of seawater contains about 50 pounds of gold.
79
10 of the tributaries flowing into the Amazon river are as big as the Mississippi river.
41
In 1850, only 8% of the people in California were women.
0
There are more than 50,000 earthquakes throughout the world every year!
47
Australia's Great Barrier Reef is 1,250 miles long!
45
The Atlantic Ocean is saltier than the Pacific Ocean.
54
The city of Houston, Texas is built on a swamp and is slowly sinking!
89