You are presented with the question "The origin of P-waves and S-waves can be traced back to what?" and the following answer choices: 
- Something with a head, thorax, and abdomen
 - chemical messengers
 - flow of electrons
 - Electrical energy
 - Faulting of rocks in the crust
 - solid, liquid, gas
 - electromagnetic energy
 - that material's properties

Now knowing that faulting of rock in Earth 's crust causes earthquakes and earthquakes generate P waves and S waves which can travel throughout the earth, choose the best answer.


 

     Faulting of rocks in the crust    