At a height h above Earth's surface, g equals its value at a depth d below the surface. For h, d≪R and uniform Earth density, approximately:
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At a height h above Earth's surface, g equals its value at a depth d below the surface. For h,d≪R and uniform Earth density, approximately:

G1 Physics · Accepted Answer

At small height, g_h≈g(1−2h/R). At small depth, g_d≈g(1−d/R). Equating gives d=2h.