Slab of sunken ocean floor found deep within Earth

Deep within Earth, halfway to its center in an area where Earth's core meets its mantle, lies a massive folded slab of rock that once was the ocean floor, reports a team of researchers in the current issue of Nature.

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<p><a href="http://www.physorg.com/news67097315.html">Slab of sunken ocean floor found deep within Earth</a></p> <p>Deep within Earth, halfway to its center in an area where Earth's core meets its mantle, lies a massive folded slab of rock that once was the ocean floor, reports a team of researchers in the current issue of <i>Nature</i>.</p>