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