12. Why is it important to know that the core is made from a large percentage of Iron and Nickel? *
Iron and Nickel melt easily, which is why the outer core can be liquid.
Iron and Nickel have a large density, which is why the core is in the middle.
Iron and Nickel have a small density, which is why the core can sink to the center.
Iron and Nickel cannot melt, which is why the inner core remains a solid.