Why Does the Flux of Methane to the Atmosphere from Coastal

question 37

Multiple Choice

Why does the flux of methane to the atmosphere from coastal marshes drop (relative to freshwater) to near zero?

• A) Because salinity and sulfate increase which prevent methane formation
• B) Because methanogenesis dominates
• C) Because decrease in salinity is due to the increased concentration of sulfates in sea water
• D) Because sulfate reduction is the dominant decomposition process in coastal marshes

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