Here is another model with more than one layer. Recall the differences in P and S wave speeds in solids and liquids, or review them in Step 4.

  !   Click the image to begin the animation. Click and drag the slider to analyze the wave patterns. Consider carefully what type of material each of the two layers is made of.

7. Observe the path taken by P and S waves in the model planet. Sketch the layers on your diagram and indicate if they are solid or liquid.