The Amazon rainforest produces more than 20% the world's oxygen supply.
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Australia's Great Barrier Reef is 1,250 miles long!
45
There are approximately three chickens for every human on Earth.
13
Mexico City is built on top of an underground resevoir!
47
The Caspian Sea is also classed as the world's largest lake.
52
A waterfall known as The Devil's Kettle empties water into a hole and nobody knows where it ends up!
18