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Layers of the Earth CRUST 5 to 70 km thick and up to 400° C (interior) The crust is the thin, rocky, outer-layer on which we live. This is the thinnest layer, but oceans and continents sit on the crust. The crust is not solid—it is actually broken into pieces we call “plates.” OUTER CORE 2,300 km thick and 4,000° C to 5,000° C Located beneath the mantle, the outer core is hotter than the mantle. It is so hot that the iron and nickel that make up this layer have melted. This is the Earth’s only liquid layer. MANTLE 2,900 km thick and up to 4,000° C Located under the crust, the mantle is the thickest layer and is divided into two parts. The upper mantle is gooey, heated rock moving slowly under the crust. The lower mantle is solid. INNER CORE 2,400 km in diameter and up to 7,000° C The inner core is also made of iron and nickel. This is the hottest layer. Due to the extreme heat and pressure at the center of the Earth, the inner core is solid.