Faulting of rock in earth 's crust causes earthquakes.
Earthquakes generate p waves and s waves which can travel throughout the earth.
P-waves and s-waves can be traced back to faulting of rock in earth's crust.
The origin of P-waves and S-waves can be traced back to what?
  - 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