Question

Which of the following lists Earth's compositional layers in order of increasing density?

Answer 1

Crust, mantle then core

Answer 2

Crust, mantle, outer core, and inner core

The core is the most dense.

Scientifically The Lithosphere is the least dense.
The Asthenosphere is known as the "weak sphere" and it is under the Lithosphere which has more density from the pressure.
The Mesosphere is the middle sphere. It is the stronger lower mantle. It is under the Asthenosphere and the Lithosphere. It has even more density.
Under that is the outer core, which is liquid iron and it is 2,200 KM Thick. ( Very, very thick) And lastly there is the inner core, which is the most dense of all with all of the other layers pressing against it!
The crust, the mantle and the core, made mostly of Iron and other dense materials