NYS Global History And Geography Regents Practice Test

Which statement correctly defines a greenhouse gas?

A gas that cools the atmosphere A gas that contributes to warming the Earth's atmosphere An inert gas with no climate impact A gas found only in outer space

Correct Answer:

A gas that contributes to warming the Earth's atmosphere

Explanation:

Greenhouse gases trap heat in Earth's atmosphere by absorbing infrared radiation emitted by the warmed surface. This trapping of heat keeps the lower atmosphere and surface warmer than they would be otherwise, which is why a gas that contributes to warming the Earth's atmosphere is the correct description. These gases are not substances that cool the atmosphere, nor are they inert with no climate impact, and they aren’t limited to outer space—they exist throughout the Earth's atmosphere. Examples include carbon dioxide, methane, nitrous oxide, and water vapor, all of which help retain heat and drive the warming effect.

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