Human-induced pollution enters the atmosphere from both ____.
A) fixed and natural sources
B) natural and secondary sources
C) fixed and mobile sources
D) natural and primary sources

Question

Quizplus · Accepted Answer

Human-induced pollution enters the atmosphere from both fixed (e.g., power plants, factories) and mobile sources (e.g., cars, trucks, airplanes). Natural sources contribute to pollution, but they are not caused by human activities. Primary sources are emissions produced directly from a source (e.g., volcano eruptions), while secondary sources are formed from chemical reactions in the atmosphere (e.g., smog).

Human-Induced Pollution Enters the Atmosphere from Both ____