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
Mexico City is built on top of an underground resevoir!
47
Forest fires move faster uphill than downhill.
52
An earthquake on Dec. 16, 1811 caused parts of the Mississippi River to flow backwards.
243
It's still possible to see the division between East and West Germany due to different light bulbs.
5
Due to gravitational effects, you weigh slightly less when the moon is directly overhead.
55
A waterfall known as The Devil's Kettle empties water into a hole and nobody knows where it ends up!
18