The size of the trees also diminishes as the altitude increases.

You may also know that air pressure decreases as altitude increases.

As altitude increases, the amount of oxygen in the atmosphere declines.

As altitude increases, atmospheric pressure decreases because there is less air to press down.

Rising air expands and cools due to the decrease in air pressure as altitude increases.

Due to Adiabatic lapse, temperature and pressure decrease as altitude increases.

In the troposphere, the temperature goes down as the altitude increases.

The temperature of the troposphere generally decreases as altitude increases.

(The value is negative because it gets colder as altitude increases.)

In these cases a traveler into the mountains encounters a curious paradox: the temperature rises as altitude increases.