What is the inner core of the Earth believed to consist of?
Nickel-steel Nickel-iron alloy Nickel–iron alloy Nife Iron-nickel alloy NiFe Nickel steel Fe-Ni Nickel-iron Nickel–iron Iron–nickel alloy
nife iron–nickel alloy iron nickel alloy nickel iron alloy nickel–iron nickel steel nickel–iron alloy fe ni nickel iron
iron nickel alloy
WikipediaEntity
Iron-nickel alloy