At different places one earth, depending on elevation, air pressure varies. What causes air pressure?

A. weight of air

B. earth’s magnetic field

C. density of nitrogen

D. the sun’s energy

Question

At different places one earth, depending on elevation, air pressure varies. What causes air pressure?
 	
	A. weight of air

	B. earth’s magnetic field

	C. density of nitrogen

	D. the sun’s energy

anonymous · Answer

please help!!!!

anonymous · Answer

ANYONE PLEASE PLEASE I AM DESPERATE

nnesha · Answer

http://en.wikipedia.org/wiki/Atmospheric_pressure hope ithelp

secret-ninja · Answer

Air pressure is caused by the weight of the air pressing down on the Earth, the ocean and the air below. Air pressure is also known as atmospheric pressure and barometric pressure.
Air pressure is the force per unit area exerted by an atmospheric column, which is the entire body of air above a specified area. Air pressure can be measured with a mercury barometer, which indicates air pressure with the height of a column of mercury that balances the weight of the column of atmosphere over the barometer. Atmospheric pressure can also be measured using an aneroid barometer, which contains one or more hollow, partially evacuated and corrugated metal disks that are supported by an inside or outside spring to prevent it from collapsing.

secret-ninja · Answer

So to sum it up, its A. :) I hope this helped!