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
A waterfall known as The Devil's Kettle empties water into a hole and nobody knows where it ends up!
18
10 of the tributaries flowing into the Amazon river are as big as the Mississippi river.
41
Mexico City is built on top of an underground resevoir!
47
The state with the longest coastline in the Continental U.S. is Michigan.
31
Check your map! Virginia extends farther west than West Virginia.
67
One cubic mile of seawater contains about 50 pounds of gold.
79
