Australia's Great Barrier Reef is 1,250 miles long!
45
Due to gravitational effects, you weigh slightly less when the moon is directly overhead.
55
The Caspian Sea is also classed as the world's largest lake.
52
The longest cave in the world is the 'Mammoth Cave System' in the USA at 560,000 mtrs deep!
63
A volcano has enough power to shoot ash as high as 50 km into the atmosphere.
59
The names of the continents all end with the same letter with which they start, excluding the North and South infront of AmericA.
86
An earthquake on Dec. 16, 1811 caused parts of the Mississippi River to flow backwards.
243