Alternatinglayers of hematite and chert

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Banded iron formations (BIFs) consist of thin, alternatinglayers of hematite (iron oxide) and chert (miroscopically small crystals of quartz). ManyBIFs formed in Earth’s earliest oceans but none form today despite theabundance of shallow ocean environments that offer potential for their formation. Scientistsbelieve that the reason for this is a drastic change in Earth’s atmosphericcomposition from its formation to the present day. What is the atmospheric change that has preventedmodern BIFs from forming? (be as specific as possible in your answer).

Reference no: EM13330078

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