Answer
(d)
Work Step by Step
Sulfur dioxide ($SO_2$) occurs naturally from volcanic eruptions, which release large amounts of sulfur gases into the atmosphere.
The answer is (d).
Environmental Science for AP* (2nd Edition)
by Friedland, Andrew J.; Relyea, Rick
Published by
W. H. Freeman
ISBN 10:
1464108684
ISBN 13:
978-1-46410-868-6
Chapter 15 - Module 46 - Major Air Pollutants and Their Sources - AP Review Questions - Page 527: 3
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