The propagation of seismic waves through Earth's interior provides evidence of internal layering. The first boundary discovered was between the

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The discovery of seismic waves propagated through Earth's interior revealed the division between the mantle and the crust, giving evidence of internal layering. The boundary between the mantle and crust is known as the Mohorovičić discontinuity or the Moho. The discovery of the Moho was a significant milestone in the understanding of Earth's internal structure. Therefore, choice D) mantle and crust is the best choice.

The Propagation of Seismic Waves Through Earth's Interior Provides Evidence