Final answer:
The Earth's inner core is dense and solid, likely containing an iron-rich alloy, surrounded by the outer core and the mantle.
Explanation:
Inner core of the Earth is very dense, solid, and likely consists of an iron-rich alloy, primarily iron and nickel. It is surrounded by the outer core, a region of liquid iron and nickel. The next layer is the mantle, mainly composed of iron and magnesium silicates.
Learn more about Earth's layers here:
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