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This "answer" does not answer the "question" (which asks about elements, not compounds such as CO2, and has nothing to do with the shape of the Earth's magnetic field!) The fact that an element (such as Oxygen) is "locked away" in compunds (such as oxides) has nothing to do with the abundance of elements -- which was the point of the actual question.

It is correct to say that the answer depends somewhat upon "the chemical composition of the earth[']s core" but there is ample evidence to support the assumption that it is composed primary of iron (plus some nickel), and that leads to the correct answer that Iron is the most common element. Speculations about Titanium are unsupported, and do not add anything relevant to the answer to the question that was asked.





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