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The scientists were able to know that the outer core is liquid due to the fact that S- waves cannot travel through this Earth’s layer as proven by the S-wave shadow zone.
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Earth´s inner core and outer core are both made of an iron-nickel alloy. The state of matter (solid, liquid or gas) of a given material depends on its temperature and pressure. Most materials, including iron and nickel, change from liquid to solid at lower temperatures and/or higher pressures.
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