Core (Earth's)
Core (Earth's) :
Central part of the Earth's interior with upper boundary at a depth of about 2900 kilometers. It represents about 16% of the Earth's volume with about 33% of the Earth's mass. It is divided into an inner, solid core, and an outer, fluid core. The outer core extends from about 2900 to about 5120 km below the Earth's surface and consists in its main components of a mixture of liquid iron and nickel. The inner core is the central sphere of the Earth with a diameter of about 1250 km and consists of solid metal. For wave velocity, density and attenuation distribution in the core, as compared to the Earth's mantle, see Fig. 2.53??? in Chapter 2 of this Manual. For further information see Jacobs (1987), Lay (2002), and Song (2002)
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