Why are only seismic waves shown in the core?

Only seismic waves are shown in the Earth's core because they are the primary means by which we study the internal structure of the Earth. Seismic waves, generated by earthquakes or artificial sources, travel through different layers of the Earth, allowing scientists to infer properties like density and state (solid or liquid) based on their speed and behavior. Other forms of energy, like electromagnetic waves, do not penetrate the Earth's interior effectively, making seismic data the most reliable source for understanding the core's composition and characteristics.