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the most abundant gas in the earth's atmosphere (~78%)


the second-most abundant gas in the earth's atmosphere (~21%)


the envelope of gases that surrounds Earth


a form of oxygen that has three oxygen atoms in each molecule instead of the usual two

water vapor

water that is in the form of a gas


the condition of Earth's atmosphere at a particular time and place


the amount of mass in a given volume of air

force pushing on an area or surface


the result of the weight of a column of air pushing down on an area

air pressure


any instrument that measures air pressure

mercury barometer

instrument that measures air pressure using liquid mercury

the distance above sea level


aneroid barometer

instrument that measures air pressure without using a liquid


the layer of the earth's atmosphere where weather occurs


the layer of the atmosphere where most meteoroids burn up


the layer of the atmosphere that contains ozone


the layer of the atmosphere where auroras appear and from which radio wave bounce off


atmosphere layer that is divided into the ionosphere and exosphere


the outer portion of the thermosphere that extends from about 400 kilometers outward for thousands of kilometers


brilliant light displays caused by particles from the that enter the ionosphere near the poles

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