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what did rusted layers of iron in sedimentary rock tell geologists about the chemical composition of the oceans long ago?
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what did rusted layers of iron in sedimentary rock tell geologists about the chemical composition of the oceans long ago?

User Rohitha
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Answer:

They knew there was dissolved iron in the early oceans -- a strong indication that Earth's free oxygen concentrations were exceedingly low.

Step-by-step explanation:

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User Ryan Silva
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