………….. process occurs in rocks which have iron present In them.
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oxidation
Commonly, the presence of iron is determined to be within a rock due to certain colorations from oxidation. ... Oxidation can occur from bacteria or by chemical oxidation. This often happens when ferrous ions come into contact with water (due to dissolved oxygen within surface waters) and a water-mineral reaction occurs.
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answer is oxidation. oxidation process occurs in rocks which have iron present in them.
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