How We Know What's Deep Inside the Earth, Despite Never Traveling There

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The extreme conditions of inner Earth make it impossible to explore. But seismic waves during earthquakes, volcanic eruptions and light waves from the Sun all have helped reveal fascinating insights about our planet’s mantle, crust, and core.
The extreme conditions of inner Earth make it impossible to explore. But seismic waves during earthquakes, volcanic eruptions and light waves from the Sun all have helped reveal fascinating insights about our planet’s mantle, crust, and core.