Inside the hot the heavy such as iron were able to sink downwards to the center, forming a liquid metallic core of and nickel, possibly with a solid at the very center. The central temperature is thought to be around 5,500 įC, about the same as the Sunís surface.
The lighter atoms, such as silicon, floated upward around the outside of the core and formed the .
Above this floats an ever changing thin 10 to 30 kilometers thick.
Structure of the Earth
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