What are the sources of sulfur in the atmosphere?
A) Decomposition and small amounts from pollution
B) Mostly transportation modes, such as autos, trucks, and planes
C) Volcanoes and hot springs, but mostly (about 75%) human activities such as burning coal
D) Natural and human sources, in equal amounts
E) Mostly (over 90%) volcanoes and photosynthetic bacteria
Correct Answer:
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