The layers of the Earth from the most dense to the least dense are:
- Inner Core
- Outer Core
- Lower Mantle
- Upper Mantle
- Crust
Density is how much mass an object has for each unit of volume. This just means how much space something takes up compared to the amount of matter that it has. When something has a lot of mass compressed into a comparatively small space, we can say that object has a high density or that it is very dense.
The Core of the Earth is divided into an inner core which is the densest, and a slightly less dense outer core. Both of these are made of iron, nickel, sulfur, and oxygen. The mantle is also divided into two parts, an Upper and a much thicker Lower Mantle. The Lower mantle is denser than the upper mantle. These layers are made of silicate rock. The most superficial and least dense layer of the Earth is the Crust.
Therefore the layers of the Earth from most to least dense are the Inner Core, Outer Core, Lower Mantle, Upper Mantle, and Crust.
For more on the Earth's layers see:
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