What Are the Sources of Sulfur in the Atmosphere

question 66

Multiple Choice

What are the sources of sulfur in the atmosphere?

• A)natural and human sources, in equal amounts
• B)volcanoes and hot springs, but mostly (about 75%)human activities such as burning coal
• C)mostly (over 90%)volcanoes and photosynthetic bacteria
• D)mostly transportation modes, such as autos, trucks, and planes
• E)decomposition and small amounts from pollution

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