chptr 15 - key concept - section 1
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| What is the composition of Earth's atomosphere? | Earth's atmosphere is made up of nitrogen, oxygen, carbon dioxide water vapor and many other gases, as well as particles of liquids and solids.
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| How is the atmosphere important to living things? | Earth's atmosphere makes conditions on Earth suitable for living.
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| What are some of the properties of air? | Because air has mass, it also has other properties, including denstiy and pressure.
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| What instruments are used to measure air pressure? | Two common kinds of barometers are mercury barometers and aneroid barometers.
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| How does increasing altitude affect air pressure and density? | Air pressure decreases as altitutde increases. As air pressure decreases, so does density.
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| What are the four main layers of the atmospher? | Scientists divide Earth's atmosphere into four main layers classified according to changes in temperature. These layers are the tropospher, the stratosphere,the mesophere and the thermosphere.
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| What are the characteristics of the troposphere? | The layer of the atmosphere in which Earth's weather occurs.
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| What are the characteristics of the stratosphere? | The second layer of the atmosphere and contains the ozone layer.
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| What are the characteristics of the mesophere? | The layer of the atmospherethat protects Earth's surface from being hit by most meteoroids.
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| What are the characteritics of the thermosphere? | The outermost layer of the Earth's atmosphere.
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| What are the major sources of air pollution? | Some air pollution occurs naturally. But many types of air pollution are the result of human activities.
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| What causes smog and acid rain? | The burning of fossil fuels can cause smog and acid rain.
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| What can be done to improveair quality? | In the United States, the federal and state governments have passed a number of laws and regulations to reduce air pollution.
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