It takes a drop of ocean water more than 1,000 years to circulate around the world.
61
Australia's Great Barrier Reef is 1,250 miles long!
45
A volcano has enough power to shoot ash as high as 50 km into the atmosphere.
59
Due to gravitational effects, you weigh slightly less when the moon is directly overhead.
55
Venice Island was built on a foundation of tree trunks. 1200 years later, those same trunks still support almost all of central Venice.
8
The average ice berg weighs 20,000,000 tons!
54
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
Europe is the only continent without a desert.
62