(2) The Gutenberg Discontinuitymarksthe boundary between two sections of Earth’sinterior, known as the lower mantle (which is considered solid) and the underlying outer core (believed to be molten). It occurs within the Earth’sinterior at a depth of about2,900 km below the surface. Itis named after Beno Gutenberg(1889-1960), a seismologist who made several important contributions to the study and understanding of the Earth’sinterior.