Science:

Geologists May Have Just Discovered A New Layer Of Earth's Mantle (The Huffington Post)

Research also suggests that the Earth's interior is hotter than previously believed 

A new study suggests that a previously unknown rocky layer may be lurking about 930 miles beneath our feet -- and evidence suggests that it's significantly stiffer than similar layers, which could help explain earthquakes and volcanic eruptions.

The finding also suggests that the Earth's interior is hotter than previously believed at that depth below the planet's surface. Dr. Lowell Miyagi, an assistant professor of geology and geophysics at the University of Utah said in the statement that he had calculated that the average temperature at the boundary of the upper and lower mantle is about 2,800 degrees Fahrenheit -- and a scorching 3,900 degrees F at the deeper, more viscous layer.

"If you decrease the ability of the rock in the mantle to mix, it’s also harder for heat to get out of the Earth, which could mean Earth’s interior is hotter than we think," he said.

The study was published online in the journal Nature Geoscience on March 23, 2015.

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