What is the name of the boundary between Earth’s crust and mantle?

The Mohorovičić discontinuity is the boundary between Earth’s crust and mantle.

It is commonly shortened to the Moho, after Croatian seismologist Andrija Mohorovičić. In 1909, he identified the boundary by studying earthquake waves that changed speed and direction as they entered deeper, denser material.

The Moho is not at a uniform depth. Beneath oceanic crust it is generally about 5–10 kilometers down, while beneath continental crust it can be roughly 30–50 kilometers deep and even deeper beneath major mountain belts.

The Moho is a seismic boundary, not a visible underground surface. Its position is inferred from changes in seismic-wave behavior, especially the sudden increase in wave velocity.