Final answer:
An example of a wave that only travels through a solid is a seismic wave, which is generated by earthquakes and travels through Earth's crust.
Step-by-step explanation:
An example of a wave that propagates only through a solid is a seismic wave. Seismic waves are generated by earthquakes and can travel as both longitudinal waves and transverse waves. These waves have different speeds depending on the rigidity of the solid medium they travel through, with more rigid materials allowing faster propagation. Unlike seismic waves, light waves can travel through a vacuum and do not require a medium, while sound waves, mainly longitudinal in fluids, can also propagate in solids and gases. However, seismic waves are unique in that they cannot travel through liquids, which is why S-waves cannot pass through Earth's liquid core. This property of seismic waves is often used to study the interior structure of the planet.