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9. +5 How did the abundant oxygen levels of earth's atmosphere happen? When did this process begin? How long did it take? What is the key life form?

10. +3 Why do we know relatively little about the Archean Eon?

11. +2 To the best of our knowledge, what must the surface weathering processes been like during the Archean?

12. +5 What are the BIF deposits of the Proterozoic and how do they relate to the economy of West Virginia during the past 150 years?