What is the 4 layers of the earth from the center to the outside of the planet?

The Earth is composed of four main layers, starting from the center: the inner core, which is solid and primarily made of iron and nickel; the outer core, a liquid layer also composed of iron and nickel; the mantle, a thick layer of semi-solid rock that flows slowly; and the crust, the thin, outermost layer where we live, consisting of solid rock and soil.