The Amazon rainforest produces more than 20% the world's oxygen supply.
182
Forest fires move faster uphill than downhill.
52
Australia's Great Barrier Reef is 1,250 miles long!
45
Mexico City is built on top of an underground resevoir!
47
A volcano has enough power to shoot ash as high as 50 km into the atmosphere.
59
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
In 1850, only 8% of the people in California were women.
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