Question

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question 1
2 pts
why does air density decrease with increasing altitude?
○ there are fewer greenhouse gases at higher altitudes
○ wind speed increases with altitude
○ temperature increases with altitude
○ gravity pulls gas molecules toward earths center, creating higher density at lower altitudes
question 2
2 pts
which greenhouse gas traps the most heat per molecule?
○ carbon dioxide (co₂)
○ water vapor (h₂o)
○ methane (ch₄)
○ chlorofluorocarbons (cfcs)

Explanation:

Question 1: Gravity exerts a downward force on gas molecules, concentrating more molecules at lower altitudes, so air density drops as altitude rises. The other options are incorrect: greenhouse gas abundance does not drive this density change, wind speed does not consistently increase with altitude, and temperature decreases with altitude in the troposphere.
Question 2: Chlorofluorocarbons have the highest global warming potential per molecule compared to the other listed greenhouse gases, meaning they trap far more heat per individual molecule.

Answer:

Question 1: Gravity pulls gas molecules toward Earth's center, creating higher density at lower altitudes
Question 2: Chlorofluorocarbons (CFCs)