There's a lake under Antarctica that is 25 million years old called Lake Vostok.
109
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
Check your map! Virginia extends farther west than West Virginia.
67
Check your map! The Pacific entrance of the Panama Canal is farther East than the Atlantic entrance.
40
A volcano has enough power to shoot ash as high as 50 km into the atmosphere.
59
The Atlantic Ocean is saltier than the Pacific Ocean.
54
Forest fires move faster uphill than downhill.
52