This description provides an overview of the composition of the Earth's core. It explains that the core is composed primarily of iron and nickel, two of the most abundant elements in the Earth's crust. It also provides some insight into the structure of the Earth's core and how it affects the planet
An iron–nickel alloy or nickel–iron alloy, abbreviated FeNi or NiFe, is a group of alloys consisting primarily of the elements nickel (Ni) and iron (Fe). It is the main constituent of the "iron" planetary cores and iron meteorites. In chemistry, the acronym NiFe refers to an iron–nickel catalyst or component involved in various chemical reactions, or the reactions themselves; in geology, it refers to the main constituents of telluric planetary cores.