The Cores of the Terrestrial Worlds Are Made Mostly of Metal

question 11

Multiple Choice

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

• A)the terrestrial worlds as a whole are made mostly of metal.
• B)metals sunk to the centers a long time ago when the interiors were molten throughout.
• 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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