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The inner core; outer core; mantle; and crust

the core is the most dense because it has all the other layers pushing on it.

A Different Answer:

Scientifically, the Lithosphere is the least dense because it has no pressure from other layers against it. It is the crust and the upper mantle.

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).

Lastly there is the inner core, which is the most dense of all with all of the other layers pressing against it!

If you want to make all of the info I have listed easier/simpler here it is:

The crust, the mantle (67% of Earth's mass) and the core, made mostly of iron and other dense materials.

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11y ago

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