Australia's Great Barrier Reef is 1,250 miles long!
45
In 1850, only 8% of the people in California were women.
0
One cubic mile of seawater contains about 50 pounds of gold.
79
The Sahara desert expands at about 1km per month.
90
The Niagara Falls moves upstream at an average rate of about 295ft a century!
48
It takes a drop of ocean water more than 1,000 years to circulate around the world.
61
Every person in the world can fit in Texas and be given over 1000 sq ft in which to live.
14
10 of the tributaries flowing into the Amazon river are as big as the Mississippi river.
41