Answered

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Banded iron formations show us when


volcanic activity started on earth

the oceans began forming on earth

oxygen became plentiful on earth

rocks were first formed on earth

Sagot :

adeoladokun31

Answer:

oxygen became plentiful on earth

Explanation:

This is because banded iron formation is formed as a result of oxygen present in the ocean which is produced from cyanobacteria which undergo photosynthesis to produce carbohydrates and oxygen.

The oxygen produced are plentiful and they react with dissolved iron on the Earth's ocean to produce iron oxides which precipitated out and form a thin line floor on the ocean.

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