Banded iron formations (BIFs) show evidence of an
A)oxygen-poor atmosphere because all of the oxygen was dissolved into the oceans and then precipitated as iron-oxide minerals.
B)acidic ocean that forced iron to bond with the oxygen in the water to form iron-oxide minerals.
C)oxygen-poor ocean because all the oxygen was trapped in the iron-oxide minerals that make up the formation.
D)oxygen-rich atmosphere that forced the oceans to become oxidizing and precipitate iron-oxide minerals.

Question

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The Answer of Banded iron formations (BIFs) show evidence of an
A)oxygen-poor atmosphere because all of the oxygen was dissolved into the oceans and then precipitated as iron-oxide minerals.
B)acidic ocean that forced iron to bond with the oxygen in the water to form iron-oxide minerals.
C)oxygen-poor ocean because all the oxygen was trapped in the iron-oxide minerals that make up the formation.
D)oxygen-rich atmosphere that forced the oceans to become oxidizing and precipitate iron-oxide minerals.

Banded Iron Formations (BIFs) Show Evidence of an