Earth's gravitational acceleration does not simply decrease with depth as it does above the surface; inside the Earth, gravity depends on the mass enclosed within a given radius, and because density increases substantially in the lower mantle and especially across the core-mantle boundary, gravity actually rises with depth through most of the mantle.
Using standard Earth models (e.g. PREM), gravitational acceleration increases gradually from about 9.8 m/s² at the surface to a maximum of about 10.6–10.7 m/s² at...
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