Banded-Iron Formations,such as the One in the Image Below,show Evidence

Multiple Choice

Banded-iron formations,such as the one in the image below,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.