The Amazon rainforest produces more than 20% the world's oxygen supply.
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Check your map! Virginia extends farther west than West Virginia.
67
One cubic mile of seawater contains about 50 pounds of gold.
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Venice Island was built on a foundation of tree trunks. 1200 years later, those same trunks still support almost all of central Venice.
8
There are approximately three chickens for every human on Earth.
13
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
The longest cave in the world is the 'Mammoth Cave System' in the USA at 560,000 mtrs deep!
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