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#science
#environment
#gulf of mexico
#dead zone
#anoxic
#anoxia
#hypoxic
#hypoxia
#fertilizer
#pollution
#nitrogen
#phosphorus
#mississippi river
#louisiana
#chemistry
#oxygen
#the earth story
#black sea
#geology
#science
#anoxic
#euxinia
#oxygen
#chemistry
#carbon
#river
#bosporus
#the earth story
#science
#geology
#sedimentary
#sunday
#mudstone
#color
#black
#anoxic
#black sea
#sediment
#the earth story
#alaska
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