Put the following in order from least dense to most dense:?

Least dense is continental crust, then oceanic crust, then mantle rock, and metallic iron is most dense. If you look at Earth's composition it makes sense. Denser objects sink and less dense objects rise or float; just like ice will float in water because it's less dense. Continental crust is always pushed up above the oceanic crust which is more dense. All crustal materials "float" on the mantle rock. And finally Earth's deep interior is partially made up of iron because iron is very dense. Crust (continental and oceanic) is on the outside, the mantle (mantle rock) is closer to the middle, while the core (metallic iron) is on the interior.