Earth's Atmosphere

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exosphere

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

the distance above sea level

altitude

ozone

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

force pushing on an area or surface

pressure

density

the amount of mass in a given volume of air

weather

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

atmosphere

the envelope of gases that surrounds Earth

stratosphere

the layer of the atmosphere that contains ozone

ionosphere

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

mesosphere

the layer of the atmosphere where most meteoroids burn up

troposphere

the layer of the earth's atmosphere where weather occurs

nitrogen

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

barometer

any instrument that measures air pressure

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

air pressure

thermosphere

atmosphere layer that is divided into the ionosphere and exosphere

auroras

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

mercury barometer

instrument that measures air pressure using liquid mercury

aneroid barometer

instrument that measures air pressure without using a liquid

oxygen

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

water vapor

water that is in the form of a gas


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