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

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The first boundary discovered between Earth's internal layers through the study of seismic waves was between the outer core and the mantle. This discovery was made possible because seismic waves change speed or are reflected at the boundaries between different materials, indicating a change in material properties.

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