The Caspian Sea is also classed as the world's largest lake.
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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
Australia's Great Barrier Reef is 1,250 miles long!
45
The longest cave in the world is the 'Mammoth Cave System' in the USA at 560,000 mtrs deep!
63
Forest growth in the US has exceeded harvest since the 1940’s. Today, we have more trees than any time in the past 100 years.
14
A volcano has enough power to shoot ash as high as 50 km into the atmosphere.
59
An earthquake on Dec. 16, 1811 caused parts of the Mississippi River to flow backwards.
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