News in Brief: Remnants of Earth's crust survive in the planet's interior

[Bok]

Slab unperturbed in the mantle for billions of years before resurfacing

More... (http://www.sciencenews.org/view/generic/id/349922/title/News_in_Brief_Remnants_of_Earths_crust_survive_in_the_planets_interior)