Earth May Have a Vast Underground “Ocean” (Video)

Slate in motion.
June 16 2014 3:09 PM

The Water Down Below

A reservoir deep beneath the Earth’s surface may contain three times the water of our oceans combined.

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Published in the journal Science, a new study supports the belief that our oceans slowly filled with water from inside the planet rather than arriving on icy comets.

Rachel Stewart is an editor who lives in Philadelphia. Check out her work here.

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