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Earth's outer core is substantially molten iron, along with molten nickel and some trace elements.
The outer core is made of molten rocks and metal so hot that they glow. Their temperature is 4,300 K

(4,030 °C or 7,280 °F) in the outer regions and 6,000 K (5,730 °C; 10,340 °F) nearer the inner core.

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