Answered

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Banded iron formations show us when:A. rocks were first formed on earthB. the oceans began forming on earthC. oxygen became plentiful on earthD. volcanic activity started on earth

Sagot :

Banded iron formations probably were formed in sea water as a result of photosynthetic cianobacteria doing photosynthesis. Almost all of those formations are fof Precambrian age, and it is thought that after the period of its formation there were no oxygen pentiful available and this process would have recorded the oxygenation of the Earth's oceans. Therefore, the correct answer is C. oxygen became plentiful on earth.

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