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
es
-0)
)
A
A)
a lower density material being present at depth.
B)
a higher density material being present at depth.
a higher density material being present at surface.
D)
an equal density material being present at surface and depth.