  We report on the feasibility of using an isotropic flux of cosmic neutrinos
in the energy range of 10 to 10,000 TeV to study the interior geophysical
structure of the Earth. The angular distribution of events in a $\sim {\rm
km}^3$-scale neutrino telescope can be inverted to yield the Earth's nucleon
density distribution. The approach is independent of previous seismic methods.
The energy spectrum of the neutrino primaries can also be determined from
consistency with the angular distribution. Depending on neutrino flux, a
reasonable density determination can be obtained with a few hundred receivers
operating for a few years.
