Banded iron formations are complex rocks that consist of

Question

Quizplus · Accepted Answer

Banded iron formations consist of alternating layers of iron-rich minerals, typically oxides such as magnetite or hematite, and siliceous chert. The iron-rich layers are often the result of ancient iron precipitating out of seawater, while the chert layers represent the remains of ancient microorganisms that lived in the ocean. Therefore, option A, interlayered oxides of iron with chert, is the correct answer. Options B and C describe rocks that are not banded iron formations, while option D is too vague to be a correct answer.

Banded Iron Formations Are Complex Rocks That Consist of