Compared to that on the surface, the earth's gravity field at the core-mantle boundary is
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The middle–mantle boundary (CMB) of Earth lies among the planet's silicate mantle and its liquid iron-nickel outer middle. This boundary is positioned at about 2,891 km (1,796 miles) intensity under Earth's surface. The boundary is located thru the discontinuity in seismic wave velocities at that intensity because of the variations among the acoustic impedances of the stable mantle and the molten outer middle. P-wave velocities are a great deal slower withinside the outer middle than withinside the deep mantle even as S-waves do now no longer exist in any respect withinside the liquid part of the middle. Recent proof indicates a wonderful boundary layer without delay above the CMB likely made from a singular segment of the fundamental perovskite mineralogy of the deep mantle named post-perovskite. Seismic tomography research have proven full-size irregularities withinside the boundary sector and appear like ruled via way of means of the African and Pacific Large Low-Shear-Velocity Provinces .The uppermost phase of the outer middle is concept to be approximately 500–1,800 K warmer than the overlying mantle, growing a thermal boundary layer. The boundary is concept to harbor topography, similar to Earth's surface, this is supported via way of means of stable-nation convection withinside the overlying mantle.[citation needed] Variations withinside the thermal residences of the middle-mantle boundary can also additionally have an effect on how the outer middle's iron-wealthy fluids flow, which can be in the long run liable for Earth's magnetic field
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