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the amount of the sun's energy that reaches earth at a given time and place


the conditions present in the troposphere at any given time


is made up in 99 % of the air we breath _____ and oxygen

air pressure

the force put on a given area by the weight of the air above it


the layer closest to Earth, where almost all weather occurs; the thinnest layer


an instrument used to measure air pressure


is made up in 99% of the air we breath nitrogen and ____


the layer of air that surrounds the earth


the levels of the four layers of the atmosphere are determined by sudden changes in ___ at each level.

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