 Mohorovičić discontinuity

The Mohorovičić discontinuity, often referred to as the "Moho," is a significant geological boundary that marks the transition between the Earth's crust and the underlying mantle. It is named after the Croatian seismologist Andrija Mohorovičić, who discovered this boundary in 1909. The Moho is typically characterized by a sudden increase in the speed of seismic waves, indicating a change in composition and physical state.