What primary method do scientists use to map the internal boundaries and physical states of the Earth's inaccessible interior?

Answer

Seismology

Scientists rely on seismology, studying how seismic waves generated by earthquakes travel, refract, and reflect through the planet, to determine density, temperature, and physical state changes deep underground.

What primary method do scientists use to map the internal boundaries and physical states of the Earth's inaccessible interior?

#Videos

An Overview of Earth's Layers - YouTube

GeologyEarthstructurelayerprocess