What is the outer core of the earth made of ?????
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They are both mainly comprised of iron and nickel, with the outer core being fully liquid, and the inner core being completely solid due to the innate pressure of the surrounding rock and magma, basically the whole Earth. Increased pressure raises the temperature needed to melt a material, allowing for the inner core to remain solid.
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The outer core, about 2,200 kilometers (1,367 miles) thick, is mostly composed of liquid iron and nickel. The NiFe alloy of the outer core is very hot, between 4,500° and 5,500° Celsius (8,132° and 9,932° Fahrenheit).
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