An earthquake on Dec. 16, 1811 caused parts of the Mississippi River to flow backwards.
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Longest officially recognized place name is Taumatawhakatangihangakoauauotamateapokaiwhenuakitanatahu.
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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
A waterfall known as The Devil's Kettle empties water into a hole and nobody knows where it ends up!
18
The city of Houston, Texas is built on a swamp and is slowly sinking!
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The longest cave in the world is the 'Mammoth Cave System' in the USA at 560,000 mtrs deep!
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The Amazon rainforest produces more than 20% the world's oxygen supply.
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The names of the continents all end with the same letter with which they start, excluding the North and South infront of AmericA.
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