Australia's Great Barrier Reef is 1,250 miles long!
45
Forest growth in the US has exceeded harvest since the 1940’s. Today, we have more trees than any time in the past 100 years.
14
10 of the tributaries flowing into the Amazon river are as big as the Mississippi river.
41
It takes a drop of ocean water more than 1,000 years to circulate around the world.
61
More than a dozen men have stood on the surface of the moon, but only three have been to Challenger Deep in the Marianas Trench, the deepest known spot in the ocean.
17
If Manhattan had the same population density as Alaska, there would only be 15 people living there.
138
An earthquake on Dec. 16, 1811 caused parts of the Mississippi River to flow backwards.
243
A waterfall known as The Devil's Kettle empties water into a hole and nobody knows where it ends up!
18