Which statement best explains why atmospheric pressure declines with altitude?
A) As altitude increases, there are fewer air molecules pressing down on a given molecule of air.
B) At higher altitudes, air is cooler and thus does not move around as much as the warmer air at lower altitudes.
C) As altitude increases, air holds less moisture and thus feels lighter.
D) There is more subsidence as altitude increases.

Question

Quizplus · Accepted Answer

Atmospheric pressure declines with altitude because there are fewer air molecules above a given surface as altitude increases, resulting in less weight and pressure exerted by the air.

Which Statement Best Explains Why Atmospheric Pressure Declines with Altitude