Answer the following question given this paragraph: 

The pressure of the earth’s atmosphere, as with any fluid, increases with the height of the column of air. In the case of earth’s atmosphere, there are some complications. The density of the air is not uniform but decreases with altitude. Additionally there is no distinct top surface from which height can be measured. We can, however, calculate the approximate difference in pressure between two altitudes using the equation . The average pressure of the atmosphere at sea level is 1.013 × 10 5 Pa. This pressure is often expressed as 101.3 kPa.


Q: What happens to the density of air as the altitude decreases?

 Choices:

- multiplies

- remains the same

- increases

- decreases

A:
decreases
