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iogann1982 [59]
2 years ago
6

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

Geography
1 answer:
Grace [21]2 years ago
7 0

Answer:

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

Explanation:

hope this helps

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