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why is iron not the second most abundant element in the earths crust?

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AnnNettie Paradise Profile

The crust is made up of much lighter rock containing many elements, particularly oxygen and silicon, as well as aluminum, iron, calcium, sodium, potassium and magnesium, in order of their abundance. Oxygen and silicon, both nonmetallic elements, make up about three fourths of the total crust by weight and 93 percent by volume. Then there are water and atmosphere, which work together to break down the rocky crust into soil.


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