The element that makes up most of the earths CORE is iron.
scientists think that the earths core is made up of mostly iron, and contains smaller amounts of copper nickel.
Refer to complete article at http://en.wikipedia.org/wiki/Inner_core
The principle element found at the Earth's core is iron.
It makes up the majority of the molten core of the earth.
scientists think that the earths core is made up of mostly iron, and contains smaller amounts of copper nickel.
In terms of weight, iron makes up approximately 5% of the earths crust, the fourth most abundant element in the crust. However, remember Earth's Core is nearly all Iron.
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Because of the difference/wavering in the earths magnetic field due to thwe fact the inner core is largely Iron....
Earth's core
Iron and nickel