The Amazon rainforest produces more than 20% the world's oxygen supply.
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An earthquake on Dec. 16, 1811 caused parts of the Mississippi River to flow backwards.
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Mexico City is built on top of an underground resevoir!
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10 of the tributaries flowing into the Amazon river are as big as the Mississippi river.
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Even Antarctica has an area code. It's 672.
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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
Louisiana is the only state that grows in land area every year (Due to alluvial deposits from the Mississippi River).
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