What Is The Composition Of The Earths Core?
The core is predominantly Iron metal (Fe). There is a significant amount of the element Nickel (Ni, about 4%) and a light element to make it less dense (about 10% by mass). This light element is either mostly oxygen or sulfur, with the arguments for oxygen (too detailed to go into here) being more believable in general. The earth’s core was formed during a time when earth was molten and the core was formed by heavier elements sinking and compacting lighter elements rising on convection currents. Hope this helps!
