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Not true. The earth's core, meaning the innermost portion of the earth constituting an imaginary sphere roughly 2000 miles in diameter, is made up of 90+ % iron, with the remainder being mostly nickel, followed by declining percentages of various heavy metals. The important thing to know aqbout the core, though, is that it is molten and thus does not have distinct layers. Convection currents within the molten core, similar to what happens to hot water on a stove, keep the core fairly well mixed so that there are not "older" and "younger" portions of the core. The aforementioned convection currents of the molten metallic core, combined with the earth's own fairly rapid rotation, are believed to be responsible for the earth's magnetic field, which plays a key role in preserving our atmosphere and shielding life on earth from radiation from solar flares.
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