Unlike other greenhouse gases, __________ does not occur naturally.
A) HCFCs
B) water vapor
C) carbon dioxide
D) methane
E) nitrous oxide

Name: Unlike other greenhouse gases, __________ does not occur naturally. A) HCFCs B) water vapor C) carbon dioxide D) methane E) nitrous oxide
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Question

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HCFCs (hydrochlorofluorocarbons) are synthetic gases and are not naturally occurring. Water vapor, carbon dioxide, methane, and nitrous oxide all occur naturally in the atmosphere.

Unlike Other Greenhouse Gases, __________ Does Not Occur Naturally