The air in Earth's atmosphere is made up of molecules of gases like nitrogen and oxygen. When air is cool, its molecules are dense, or packed tightly together. When air is warm, it
becomes less dense and rises, leaving behind a space with low pressure. Cool, dense air
rushes in to fill that space. The air rushing in is wind. Eventually the warm air cools and
sinks back down to earth, continuing a cycle that moves air and produces wind.
Which of the following best describes the relationship between air temperature and
density?
A
When air temperature is stable, it becomes more dense.
B
As air gets cooler, it becomes less dense.
с
As air gets warmer, it becomes less dense.
D
Air temperature cannot be used to predict air density.