provide evidence of past life, and thus help geologists understand how life, and the environments changed throughout Earth's history.
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![provide evidence of past life, and thus help geologists understand how life,
and the environments changed throughout Earth's history.
Fossils
Igneous rocks
Faults
Strata](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2Fd4d75fcb-d719-4460-9746-c58c7476bafc%2Fdf93154b-66fe-4082-8f06-f89edff230f2%2F9j60zag_processed.png&w=3840&q=75)
![Which of the following statements about the banded iron formations is true?
The BIFs show evidence of an oxygen-rich atmosphere that forced the oceans to
become oxidizing and precipitate iron-oxide minerals. They are abundant at the
beginning of the Proterozoic Eon.
The BIFs show evidence of an oxygen-poor ocean because all the oxygen was
trapped in the iron-oxide minerals that make up the formation.
The BIFs show evidence of a salt-free ocean that forced iron to bond with the
oxygen in the water to form iron-oxide minerals.
The BIFs show evidence of an oxygen-poor atmosphere because all of the
oxygen was dissolved into the oceans and then precipitated as iron-oxide
minerals.](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2Fd4d75fcb-d719-4460-9746-c58c7476bafc%2Fdf93154b-66fe-4082-8f06-f89edff230f2%2F5i4sj3i_processed.png&w=3840&q=75)
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