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 ...

TEMPE, Ariz. – 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 ...

The sunken slab now sits sandwiched between the upper and lower mantle, in the mantle transition zone. This transition zone stretches between 255 and 410 miles (410 to 660 kilometers) deep beneath ...

Arizona State University. "Slab Of Sunken Ocean Floor Found Deep Within Earth." ScienceDaily. ScienceDaily, 3 June 2006. <www.sciencedaily.com / releases / 2006 / 06 / 060603092903.htm>.