For the sake of these questions, imagine two planets, each with five internal layers as described below.

Planet X - Composition & physical state of internal layers.                                   

Layer A - Solid metals                                                                                       
Layer B - Dense, solid rock                                                                               
Layer C - Less dense, solid rock                                                                        
Layer D - Water                                                                                                 
Layer E - Heat-softened rock                                                                             

How would P-waves and S-waves behave as they moved from one layer to the next? Why would these changes occur?

Answers for Planet X

Planet Y - Composition & physical state of internal layers.

Layer A - Less dense, solid rock
Layer B - Molten magma
Layer C - Liquid metals
Layer D - Dense, rolid rock
Layer E - Gas

How would P-waves and S-waves behave as they moved from one layer to the next? Why would these changes occur?

Answers for Planet Y