Mohorovičić's observation, commonly referred to as the Mohorovičić Discontinuity or "Moho," indicated that seismic waves traveled at varying speeds through different layers of the Earth. Specifically, he discovered that seismic waves travel faster in the denser materials of the Earth's mantle compared to the less dense materials of the crust. This observation helped identify the boundary between the Earth's crust and the underlying mantle, marking a significant advancement in the understanding of Earth's internal structure. Therefore, the correct answer is:
Seismic waves travelled at varying speeds.
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