Because as you get closer to the surface of the earth, the more air that is on top of you. At the top of the atmosphere, there is no air, and everything is a vacuum, where you have no weight. When you get close to the earth, the weight of the air builds until it when you're at the very lowest point of the earths surface, all the air in the atmosphere above you is pressing down.
Air pressure is the weight of all the air above where you are measuring at.
And at the surface ALL of the air is above you.
(Actually, if you go down a deep hole then the pressure does go up.)
Air pressure is always greater nearer the earth surface than at altitude due to the mass of air above.
the air pressure increases
Sinking air would add air to the surface, raising the pressure.
Air pressure toward regions of lower air pressure
it decrease and it is globel warming
Air pressure is always greater nearer the earth surface than at altitude due to the mass of air above.
air pressure is the highest near the earths surface
the air pressure increases
Yes. Atmospheric pressure is the pressure caused by air when it exerts pressure on the surface of earth.
The weight of the air on the earth is called... Air Pressure
Sinking air would add air to the surface, raising the pressure.
Air pressure toward regions of lower air pressure
weak and strong,it depends
Air pressure Gradient
The air is thinner the higher you go.
In simple terms... gravity ! Gravity is holding the air close to the surface of the Earth. The further away you are from the surface - the lower the gravity - and thus the lower the air pressure.
The air above it weighs it down.