There's a lake under Antarctica that is 25 million years old called Lake Vostok.
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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
Check your map! Virginia extends farther west than West Virginia.
67
Europe is the only continent without a desert.
62
The city of Houston, Texas is built on a swamp and is slowly sinking!
89