Why is moho important?
The Mohorovicic Discontinuity, or Moho, is the boundary between the crust and the upper mantle. Its discovery in 1909 was the first direct evidence of the layered structure of the Earth.
The Moho was discovered by Croation seismologist Andrija Mohorovicic in 1909 by studying the motion of seismic waves near the surface of the Earth. Waves were found to accelerate if they went a few tens of kilometers down. Mohorovicic recognized that this was due to a continuous change in the composition of the rock, what we now consider the boundary between the crust and the upper mantle.
Later findings with waves traveling deep inside the Earth reveal its full multi-layered structure.