stop000juyles
Answered

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send help asap this is so important please

Send Help Asap This Is So Important Please class=

Sagot :

Jin1010

Answer:

A

Explanation:

you were right the first time.

Banded iron formations (also known as banded ironstone formations or BIFs) are distinctive units of sedimentary rock consisting of alternating layers of iron oxides and iron-poor chert. ... Almost all of these formations are of Precambrian age and are thought to record the oxygenation of the Earth's oceans.

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