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In the whole earth, the four most common elements (by mass) are oxygen, silicon, magnesium, and ________.
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In the whole earth, the four most common elements (by mass) are oxygen, silicon, magnesium, and ________.

User Ekk
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I believe that the answer is iron.
User CasaDelGato
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Hey there!

In the whole earth, the four most common elements (by mass) are oxygen, silicon, magnesium, and ________.

Answer: iron

Hope this helps
Have a great day (:
User Rajeev
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