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The inside of our Earth is made up of four different layers, which of these is not one of those layers?

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Interesting fact:

The very center of the Earth is made up of iron and nickel and, due to the intense pressure, is completely solid. It’s also not as hot as you would imagine! It’s actually a cool 5,000 – 6,000 degrees Centigrade (9,000-11,000 degrees Fahrenheit)...oh, wait.