Question

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Answer 1

It is widely accepted that the Earth’s interior is composed of several layers: the crust, the mantle and the core. Since the crust is readily accessible, scientists have been able to perform hands-on experiments to determine its composition; studies on the more distant mantle and core have more limited opportunities samples, so scientists also rely on analyses of seismic waves and gravity, as well as magnetic studies.

Answer 2

Much of what we know about Earth's interior comes from seismic waves. Seismic waves are waves of energy that can be caused by earthquakes. The two main types of seismic waves are body waves and surface waves. Body waves travel through the Earth's interior in all directions.