পৃথিবীর ঘনত্ব ($\rho$)হলো$-$

$\dfrac{\mathrm{GM}}{\mathrm{R}^{2}}$

$\dfrac{\mathrm{GM}}{\mathrm{r}}$

$\dfrac{3\rm{g}}{4\pi\rm{GR}}$

$\dfrac{\rm{G M m}}{\rm{d}^{2}}$