What is the moho boundary?
Discontinuities between rocks of the lower crust and the differing but related rocks of upper mantle is called Moho..
These discontinuities, at depths of 30-60 km, in between lower crust
and upper mantle in
related rocks are revealed in the study of propagation of earthquake
(seismic ) waves.
The naming Moho is after seismic-shock researcher Andrija