Question

Where exactly does the Moho occur?

Answer 1

The Moho, or Mohorovicic Discontinuity, is the boundary between the crust and the mantle. It occurs an average of about 30 km below the surface of continents, but much closer or perhaps even partially exposed under the oceans.

Explanation:

A map of the depth of the Moho, accompanied by a cross-sectional view showing the various layers,and boundaries in the Earth, may be found at http://geology.com/articles/mohorovicic-discontinuity.shtml.