Answer the following question given this paragraph: 

Like density, the pressure of the air decreases with altitude. There is less air pressing down from above the higher up you go. Look at the bottle in Figure below . It was drained by a hiker at the top of a mountain. Then the hiker screwed the cap on the bottle and carried it down to sea level. At the lower altitude, air pressure crushed it. Can you explain why?.


Q: Density and pressure of air decreases with what?

 Choices:

- temperature

- humidity

- horizontal distance

- altitude

A:
altitude
