Answer:
liquids
Step-by-step explanation:
Seismic wave (also called S waves) is simply the name given to waves that travel internally across the planet or on its surface as a result of major events, such as earthquakes.
They can be classified into two groups, depending on the medium in which they are propagated. The volume waves that propagate inside the Earth and the surface waves, which as the name suggests, propagate on the surface. Each classification groups waves that have different shapes, speeds and natures.
The Earth's outer core does not transmit S waves because it is formed by iron and the material is in a liquid state.
S waves have a shear movement, which means that the soil is displaced perpendicular to the direction of propagation, and propagate only in solids, since fluids have no shear resistance. The animations below show how these waves are propagated.