Question

Which of these statements is correct about P and S seismic waves?

Both P and S waves travel along Earth's surface and their amplitude decreases with depth into Earth.

Both P and S waves travel with the same speed through Earth and their amplitude increases with time.

P waves are radiated along a single direction but S waves are radiated along all directions.

P waves change the volume of the medium through which they travel but S waves do not change the volume of the medium.