Q. What is the average density of the 'core' of the Earth?
Answer: 12 gm/cm3
Notes: The average density of the Earth's core varies by layer, with the inner core being denser than the outer core:  Inner core The density of the inner core ranges from 12.8 g/cm3 at the top to 13.1 g/cm3 at the bottom. The inner core is solid and made up of mostly iron and some nickel. Outer core The density of the outer core ranges from 9.9 g/cm3 at the top to 12.2 g/cm3 at the bottom. The outer core is liquid. The density of the Earth's core increases with depth. The liquid just above the inner core is less dense than the inner core, at about 12.1 kg/L.