Seismic Signals Confirm Existence Of Earth’s Innermost Core – Forbes

Cross-section of the varying layers of the Earth.
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Traditionally we’ve been taught the Earth has three main layers: the crust, the mantle, and the core. Observations of how seismic waves are reflected and scattered, and experiments based on how minerals react to high pressure and temperatures, show that Earth’s inner structure is more complicated than previously thought.
Earth’s mantle is composed mostly of magnesium, iron, and silicon-dioxide, but depending on temperature and pressure, different…

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