Scientists believe so for several reasons. For one, the average density of the Earth is 5,515 kg/m, but since the average density of surface material is only around 3000 kg/m, it seems mathematically logical that denser material exists near the core. Seismic measurements have also found that that the core is divided into two parts, a liquid outer core (magma) and a solid inner core probably composed primarily of iron and nickel.
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