The outer core is the densest layer of Earth due to gravitational compression and the generation of radiogenic heat.
The outer core of Earth is the densest layer due to a combination of factors. Firstly, as a result of gravitational compression, the outer core is under immense pressure, causing its material to be highly dense. Additionally, the generation of radiogenic heat contributes to the density of the outer core, leading to its liquid state. These factors combined make the outer core the densest layer of Earth.
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