Hydrocarbons and nitrogen oxides combine with water vapor in the presence of sunlight to form a gray layer of ________.
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Q37: Humans breathe in air that contains nitrogen,
Q38: Although it was one time hoped that
Q39: Human activities have resulted in at least
Q40: A renewable energy source that taps into
Q41: An increase in the current fertility rate
Q43: Prolific growth of algae as a result
Q44: Twenty-five percent of all prescription drugs sold
Q45: Sources of energy that are renewable and
Q46: Match the following air pollutants to their
Q47: Match the following air pollutants to their
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