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Home Q & A Board Science-Related Homework Help Geography and Earth Sciences
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drelog drelog
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8 years ago
Banded Iron Formations are interbedded iron oxides and chert that formed on the sea floor between 3.5 and 2 billion years ago because ________.
A) outgassing produced both chert and iron oxide in roughly equal amounts and the oceans became saturated with them
B) chert was being deposited by bacteria and iron was a common ocean deposit
C) iron was using the oxygen produced by bacteria and chert was a common ocean deposit
D) photosynthesis had not yet started to generate oxygen so iron and chert were the deposited on the sea floor
E) iron and chert were very abundant in the early earth
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Earth Science

Earth Science


Edition: 14th
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drelog Author
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8 years ago
Exactly what I needed, exam is tomorrow!
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