The Cores of the Terrestrial Worlds Are Made Mostly of Metal

question 131

Multiple Choice

The cores of the terrestrial worlds are made mostly of metal because ________.

• A) metals sunk to the centers a long time ago when the interiors were molten throughout
• B) the terrestrial worlds as a whole are made mostly of metal
• C) the core contained lots of radioactive elements that decayed into metals
• D) over billions of years, convection gradually brought dense metals downward to the core

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