The Great Oxygenation Event occurred ~2.5 Ga and forced large amounts of ________ to precipitate out of the ocean.
A)oxygenated halite
B)banded iron formation
C)carbonate minerals
D)carbon-rich coal

Question

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The Great Oxygenation Event (~2.5 billion years ago) was a significant milestone in the history of Earth's atmosphere. Prior to this event, the Earth's atmosphere lacked oxygen, but the emergence of photosynthetic organisms gradually led to the accumulation of oxygen. This oxygen reacted with iron ions in seawater to form banded iron formation (BIF), which are layers of iron-rich rock that were laid down in the ancient oceans. The precipitation of BIFs is a hallmark of the Great Oxygenation Event, and they are still found today in many locations around the world.

The Great Oxygenation Event Occurred ~2