There’s a Huge Underground Ocean That Could Explain the Origin of Seas

TIME

Geologists have long mused about the origin of earth’s seas. Did water, for example, arrive from somewhere else — like on icy comets that struck the planet? Or did water come from somewhere within?

The recent discovery of a subterranean sea, deep inside earth, has scientists excited about the latter possibility.

Like something out of early 19th century playwright Jules Verne’s novel, Journey to the Center of the Earth — in which characters stumble across a massive underground basin — a team of geologists led by Steven Jacobsen from Northwestern University have found a vast body of water, three times the size of any ocean, located near earth’s core. It’s possible that water from this enormous reservoir oozed to the surface.

“It’s good evidence earth’s water came from within,” Jacobsen told NewScientist.

Jacobsen and his team used seismometers in their find, studying the speed of seismic waves to determine what…

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