Nickel and iron or iron and nickel
(is the same)
Nickel and Iron
iron and nickel
Nickel(Ni) and Iron(Fe)
iron and nickel
Iron (Fe), and Nickel (Ni).
The inner core and the outer core. The outer core is made of molten metal and the inner core is made of solid metal.
Inner Core and Outer Core
Outer Core and inner core
2
The solid inner and liquid outer core.
nickel
2 - Inner and Outer
2 miles