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
It takes a drop of ocean water more than 1,000 years to circulate around the world.
61
The 'King Ranch' in Texas is bigger than the state of Rhode Island.
49
The Niagara Falls moves upstream at an average rate of about 295ft a century!
48
A waterfall known as The Devil's Kettle empties water into a hole and nobody knows where it ends up!
18
There are more than 50,000 earthquakes throughout the world every year!
47
Israel's Dead Sea is 1,312 feet below sea level.
48