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#science
#chemistry
#oxygen
#fugacity
#geology
#precambrian
#proterozoic
#archaean
#the earth story
#geology
#chemistry
#oxidation
#redox
#oxygen
#fugacity
#slate
#metamorphic
#science
#the earth story
#color
#geology
#chemistry
#oxidation
#redox
#oxygen
#fugacity
#slate
#metamorphic
#science
#the earth story
#color
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