What happens to air pressure as you move upward into the atmosphere? it increases

it decreases

it remains constant or stays the same

it fluctuates and increases and decreases

Pressure decreases with increasing altitude

Explanation:

At higher elevations, there are less air moecules.

Explanation:

The pressure exerted by the air in the atmosphere is greatest at Earth's surface and falls as altitude increases. The reason is that density and depth of the atmosphere are greatest at sea level and decline with increasing altitude.

it has both hydrogen and oxygen