A watery surprise from Earth's depths: Mineral provides first direct evidence for water in mantle's transition zone

From a depth of more than 500 kilometers, Earth has coughed up a water-bearing mantle mineral never before found on the surface. The surprise finding suggests the planet’s interior holds more water than all its oceans combined, and could help explain how Earth’s massive tectonic plates move.

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Gabriel Popkin

Gabriel Popkin is a freelance writer based in Mount Rainier, Md.

Monday, July 14, 2014 - 03:00