What is the primary method scientists use to determine the layering of the interior of the Earth?

Question

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Scientists use seismic waves to determine the layering of the interior of the Earth. Seismic waves are waves of energy that travel through the Earth as a result of earthquakes, explosions, or other sources of energy. When seismic waves encounter different materials in the Earth, they change speed and direction, providing scientists with information about the density, temperature, and pressure of the materials they are traveling through. This allows them to create a model of the different layers of the Earth's interior.

What Is the Primary Method Scientists Use to Determine the Layering