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Answer:
Observe the model of earth's layers. On the right side is the pathway of the P wave as it travels through Earth, on the left is the pathway of S wave as it travels through Earth. Do you remember what you have learned about waves passing through a medium of different density? Like sound and light, seismic waves also refract, and because of these bending, scientists were able to distinguish the inner layers. Guide Questions: 1. How did the scientist discover that crust is a different layer from the mantle? 2. Why can't s wave pass through the outer core? 3. How is outer core different from the inner core? V. Reflection Is knowing the different layers of the Earth important? Why or why not?.