(D double prime) section of this region, and in 1959, Beno Gutenberg noticed that seismic waves travel more slowly in a part of this region called the low-velocity zone.
Ferropericlase as well as magnesium silicate, or post-perovskite, are both thought to be components of the D'' (D double prime) section of this region, and in 1959, Beno Gutenberg noticed that seismic waves travel more slowly in a part of this region called the low-velocity zone. Its boundary with the outer core is hypothesized to be the source of its namesake plumes, while the Mohorovicic discontinuity separates the crust and, for ten points, what layer of the Earth below the crust and above the Core?
Ferropericlase as well as magnesium silicate, or post-perovskite, are both thought to be components of the D''
{Mantle}