Why Is the Core of Earth Made Up Predominantly of the Heavy

question 152

Multiple Choice

Why is the core of Earth made up predominantly of the heavy element iron?

• A) Chemical processes refined iron from iron oxides and other compounds in primordial rocks at the high temperatures of Earth's core, similar to present-day iron ore processing.
• B) Nuclear reactions in the very hot early core of Earth produced iron from lighter elements by nuclear fusion.
• C) The heavy elements sank slowly to the center during early molten phases in Earth's geological history.
• D) The heavy elements came together first out of the primordial dust and gas to form the initial Earth because of their greater density and gravitational attraction, and this core then attracted lighter rocks to its surface.

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