Much of the world's supply of iron comes from banded iron deposits that formed between 1.8 and 2.6 billion years ago. In addition to being a source of iron, why are these deposits important in geology?
A. provide evidence of the earliest known sedimentary rocks
B. provide proof of the first known ice ages
C. represent the point in time when free oxygen was becoming more abundant
D. mark the point in history when marine mammals were first beginning to evolve
E. all of the answers listed here
Answer: C
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