Answer
(c)
Work Step by Step
Natural sources of air pollution include forest fires ($CO$, $PM$), volcanic eruptions ($SO_2$, ash), dust storms ($PM$), and conifer trees ($VOC$s).
Waterfalls do not emit pollutants.
The answer is (c).
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 - AP Environmental Science Practice Exam - Section 1: Multiple-Choice Questions - Page 550: 18
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