What is the earth crust value for Fe (in unit of mg/kg)?

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Juergen Wiegel

"wt%" refers to weight per hundred, Thus, assuming the given percentage (w%) are indeed " weight per weight percent" (wt/wt), 4.09 % (wt/wt) means 4.09 gram iron per 100 g of earth crust.

Md. Saiful Islam

Thank u very much prof. Juergen Wiegel.

Noori Kh Fayad

Saif ultimate lelan.o.09% = 0.09 Gm Fe in 100 Gm crust

Thank u very much Dr. Noori Kh Fayad

Ketil Haarstad

see attachment

Dear Dr. Ketil Haarstad,

A lot of thanks.

kind regards

Thank u very much dear Mr. Toskë L. Kryeziu