Which natural processes release sulfur into the atmosphere?

Which natural processes release sulfur into the atmosphere?

• A. Sea spray; anaerobic respiration by sulfate-reducing bacteria releasing hydrogen sulfide; volcanic activity releases sulfur gas.
• B. Sulfur released only by erosion.
• C. Plants release sulfur as a gas.
• D. Sulfur never enters the atmosphere.

Answer: (A)

Sulfur gets into the atmosphere through natural releases of sulfur-containing compounds directly into the air or as aerosols. Sea spray from the ocean carries dissolved sulfur compounds and sulfur-containing gases produced by marine organisms; as these droplets form and disperse, sulfur is emitted into the atmosphere. In anaerobic environments, sulfate-reducing bacteria convert sulfate to hydrogen sulfide, which can be released as a gas and enter the air. Volcanic activity also vents sulfur gases like sulfur dioxide and hydrogen sulfide during eruptions and degassing, adding sulfur to the atmosphere. Other options don’t capture the main natural pathways: erosion may release sulfur-bearing minerals, but not large-scale atmospheric sulfur; plants don’t emit sulfur gas in significant amounts; and sulfur certainly does enter the atmosphere through these natural processes.

Sulfur gets into the atmosphere through natural releases of sulfur-containing compounds directly into the air or as aerosols. Sea spray from the ocean carries dissolved sulfur compounds and sulfur-containing gases produced by marine organisms; as these droplets form and disperse, sulfur is emitted into the atmosphere. In anaerobic environments, sulfate-reducing bacteria convert sulfate to hydrogen sulfide, which can be released as a gas and enter the air. Volcanic activity also vents sulfur gases like sulfur dioxide and hydrogen sulfide during eruptions and degassing, adding sulfur to the atmosphere. Other options don’t capture the main natural pathways: erosion may release sulfur-bearing minerals, but not large-scale atmospheric sulfur; plants don’t emit sulfur gas in significant amounts; and sulfur certainly does enter the atmosphere through these natural processes.