Mohorovicic Discontinuity:

The Mohorovicic Discontinuity, or “Moho”, is the boundary between the earth’s crust and the mantle.

The Mohorovicic Discontinuity was discovered in 1909 by Andrija Mohorovicic , a Croatian seismologist. Mohorovicic realized that the velocity of a seismic wave is related to the density of the material that it is moving through. He interpreted the acceleration of seismic waves observed within Earth’s outer shell as a compositional change within the earth. The acceleration must be caused by a higher density material being present at depth.

A self-descending, radiogenic heat powered tungsten capsule has been proposed to explore the “Moho.”

geology.com

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