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
In 1850, only 8% of the people in California were women.
0
The Atlantic Ocean is saltier than the Pacific Ocean.
54
Check your map! Virginia extends farther west than West Virginia.
67
Forest fires move faster uphill than downhill.
52
The Niagara Falls moves upstream at an average rate of about 295ft a century!
48
If Antarctica's ice sheets melted, the worlds oceans would rise by 60 to 65 metres (200 - 210ft) - everywhere
181