The core, mantle, and crust of a planet are defined by differences in their

Name: The core, mantle, and crust of a planet are defined by differences in their
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The core, mantle, and crust of a planet are defined by differences in their density. The core is the densest layer, holding the majority of the planet's mass. The mantle is less dense than the core but denser than the crust. The crust is the thinnest and least dense layer, composed mainly of solid rock.

The Core, Mantle, and Crust of a Planet Are Defined