Multiple Choice
Why did banded iron formations form between 2.4 and 1.8 Ga?
A) The oceans became oversaturated in iron.
B) The oceans began to absorb large amounts of oxygen.
C) Cyanobacteria stopped using them as nutrients.
D) A mass extinction released iron into the oceans.
Correct Answer:
Verified
Correct Answer:
Verified
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