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Bair, Chapter 1: The Atmosphere

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Question/Vocab. word
Answer
weather   the condition of earth's atmosphere at a particular time and place  
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atmosphere   the envelope of gases that surrounds the planet  
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ozone   a form of oxygen that has three oxygen atoms in each molecule  
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water vapor   water in the form of a gas  
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density   the amount of mass in a given volume  
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pressure   the force pushing on an area or surface  
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air pressure   the result of the weight of a column of air pushing down on an area  
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barometer   an instrument that is used to measure air pressure  
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mercury barometer   a glass tube open at the bottom end and partially filled with mercury; measures air pressure  
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aneroid barometer   an airtight metal chamber sensitive to changes in air pressure  
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altitude   elevation; distance above sea level; the average of the surface of the oceans  
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list three factors affecting air pressure   temperature, altitude, water vapor content  
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troposphere   the layer of the atmosphere in which Earth's weather occurs  
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What is the rate at which temperature decreases in the troposphere?   drops 6.5 degrees celsius for every kilometer in altitude  
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stratosphere   second layer of atmosphere; contains the ozone layer  
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Describe the temperature change in the stratosphere   Temperature begins very cold (-60 c) but warms with increasing altitude due to the ozone layer  
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mesosphere   middle layer of the atmosphere  
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What is a main characteristic of the mesosphere   protects earth's surface from being hit by most meteoroids.  
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Define: Thermosphere   outermost layer; has no definate outer limit; thermo- means heat  
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Describe the Ionosphere   lower part of the thermosphere; engery from sun causes gas molucules to become electrically charge particles called ions; auroras occur; radio waves bounce here  
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Describe the Exosphere   Outer layer of thermosphere;  
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Created by: jlbair
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