<P> The crust lies on top of the mantle , a configuration that is stable because the upper mantle is made of peridotite and so is significantly denser than the crust . The boundary between the crust and mantle is conventionally placed at the Mohorovičić discontinuity , a boundary defined by a contrast in seismic velocity . </P>
<P> The crust lies on top of the mantle , a configuration that is stable because the upper mantle is made of peridotite and so is significantly denser than the crust . The boundary between the crust and mantle is conventionally placed at the Mohorovičić discontinuity , a boundary defined by a contrast in seismic velocity . </P>
the lower boundary of earth 's crust is called the
the lower boundary of earth 's crust is called the
Mohorovičić discontinuity
Mohorovičić discontinuity