Which of these statements is correct about P and S seismic waves? (2 points) Question 40 options: 1) Both P and S waves travel along Earth's surface and their amplitude decreases with depth into Earth. 2) Both P and S waves travel with the same speed through Earth and their amplitude increases with time. 3) P waves are radiated along a single direction but S waves are radiated along all directions. 4) P waves change the volume of the medium through which they travel but S waves do not change the volume of the medium