Wrapped in legend and tradition, the core of the Earth has long fascinated writers and scientists. For a while ', the composition of the core of the Earth was an unattainable mystery solved ... at least in the 40s. Thanks to meteorites, scientists measured the original balance of essential minerals on the planet, and they noticed what was missing. Hypothesized that iron and nickel, which are absent in the crust, had to be in the core. But gravity measurements in 1950 revealed that those estimates were in error. The core was too light. Today, researchers continue to assume such elements represent the deficit density under our feet. I am also puzzled by the periodic reversals of the Earth's magnetic field, which is generated by the flow of liquid iron in the outer core.
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