4 core outer and inner core.
4.1 outer core (outer core) is a floor under the Admiralty had deep around 2 900-5,,140 kilometers from the surface low wave P speed increases slowly, while the wave S cannot movement through the
4.2 core layer. (inter core) is at a depth of about, 5140 km to the center of the world, the wave speed is P S and remained relatively stable. Because the inner core is solid, with homogeneous
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