mohorovicic discontinuity

English Thesaurus

1. the boundary between the Earth's crust and the underlying mantle (noun.object)

instance hypernym	:	bound, boundary, bounds,
definition	:	the line or plane indicating the limit or extent of something (noun.location)

domain category	:	geology,
definition	:	a science that deals with the history of the earth as recorded in rocks (noun.cognition)