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আবহবিকারের ফলে উপপৃষ্ঠীয় অংশে ফেরাস অক্সাইড ফেরিক অক্সাইডে পরিণত হয়।
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আবহবিকারের ফলে উপপৃষ্ঠীয় অংশে ফেরাস অক্সাইড ফেরিক অক্সাইডে পরিণত হয়।