The correct statement that describes both P-waves and S-waves is:
• Both waves cause earthquakes.
P-waves (primary waves) and S-waves (secondary waves) are both types of seismic waves generated by earthquakes. P-waves are compressional waves that move the ground in the direction they travel, while S-waves are shear waves that move the ground perpendicular to the direction they travel. However, the option that states both waves cause earthquakes is the only statement that applies to both.