The terrestrial planet cores contain mostly metal because

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This is known as the "iron catastrophe" and occurred early in the history of the solar system when the interiors of the terrestrial planets were molten throughout. During this time, metals like iron and nickel sank to the center of the planet, forming a core, while less dense materials like rock and silicates rose to the surface to form the crust. This process is supported by evidence from both the composition of the planets themselves and computer models of their formation.

The Terrestrial Planet Cores Contain Mostly Metal Because