The Earth's core is its central area, part of the set of layers form the planet.
Court of the Earth, from core to exosphere. Only part of the drawing is escala.La Earth's average density is 5,515 kg/m3, the largest in the Solar System. Since the average density of surface materials is only about 3,000 kg/m3, there must be more dense materials in core of our planet. Seismology gives us further evidence of the high density core. During the formation of the planet, about 4,500 million years, gravity caused denser substances to sink toward the center, while lighter materials floated to the cortex, a process called planetary differentiation. Because of this, the Earth's core is composed mostly of iron (80%), together with nickel and several light elements, other chemicals dense as lead and uranium, are either too rare on Earth or prone to chemical combination with lighter elements, and therefore remain on the surface.
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