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The Earth is made up of three main layers called the crust, mantle and core.
The crust is the thin, rigid top layer. It can be as thin as 5 kilometers (3 miles) or as thick as 100 kilometers (60 miles). The outer part of the crust is called the lithosphere; it contains the crust and top solid part of the mantle. The asthenosphere is below the lithosphere and contains hot semi-solid material that feels like putty and can soften and flow.
The mantle is a dense, hot layer of semi-solid rock approximately 2,900 kilometers (1,800 miles) thick.
The core is at the center of the Earth. It is twice as dense as the mantle and made mostly of metal. There is the outer core, which is mostly liquid metal, and the inner core, which is solid metal.
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