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