This image displays the most fundamental layers of Earth's interior: the chemically unique crust, mantle and core. The silicate rock mantle is compresses to a more dense rock due to a phase transition at 660 km depth. This depth marks the division between the upper and lower mantle. Earth's iron core also has further subdivisions: the outer core is molten and the inner core is solid. Seismologists have detected further layering in Earth, such as at the bottom 200-300 km of the mantle, called the D" layer (not pictured).
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