How Did Large Iron Deposits,called Banded Iron Formations,form

question 76

Multiple Choice

How did large iron deposits,called banded iron formations,form?

• A)hot water circulates along the margins of a caldera
• B)groundwater mixes with seawater in the subsurface
• C)magma releases metal-rich fluids that replace reactive rocks
• D)an increase in oxygen in Earth's atmosphere caused seas to precipitate beds of iron-rich minerals

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