Answer :
Seismic Waves follow curved paths inside Earth because with depth the speed of seismic waves increases.
In the event that there were no changes with depth, seismic waves would make a trip a straight way to the opposite side of the Earth. Yet, wave appearances to far off seismic stations have instructed us that there are layers. Seismic waves travel through the Earth and keep similar laws of refraction and reflection as some other wave at interfaces. At the point when they experience limits between various media, the waves respond as indicated by Snell's regulation, and the point of refraction across the limit will rely upon the speed of the second media comparative with the first
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