The layers of Earth from hottest to coldest are the inner core, outer core, mantle, and crust. The inner core is primarily composed of solid iron and nickel and has temperatures exceeding 5,000 degrees Celsius. The outer core is liquid and also very hot, followed by the mantle, which is semi-solid and cooler. The crust is the Earth's outermost layer and is the coolest, with temperatures varying significantly depending on location.
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