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Atmosphere

Practice Test
      
  1.Where can CFCs be found?  
  a.   all answers are correct  
  b.   air conditioners  
  c.   aerosol sprays  
  d.   refrigerators  
  Hint    
      
  2.How do CFCs destroy ozone?  
  a.   A chlorine atom from a CFC combines with one oxygen from ozone and leaves a two- atom oxygen molecule.  
  b.   A CFC combines with a three-atom oxygen molecule.  
  c.   A carbon atom from a CFC combines with one oxygen from ozone and leaves a two-atom oxygen molecule.  
  d.   A chlorine atom from a CFC combines with two oxygen atoms from ozone and leaves an oxygen atom.  
  Hint    
      
  3.What would happen if Earth had no atmosphere?  
  a.   The days would be cold and the nights would be hot.  
  b.   Earth would not have days.  
  c.   The days would be hot and the nights would be cold.  
  d.   Earth would not have nights.  
  Hint    
      
  4.What is the outermost layer of the atmosphere called?  
  a.   thermosphere  
  b.   exosphere  
  c.   stratosphere  
  d.   mesosphere  
  Hint    
      
  5.Why are there fewer molecules of air up in the mountains?  
  a.   because air pressure is the same throughout all layers of the atmosphere  
  b.   because air pressure increases as you go higher  
  c.   because air pressure decreases as you go higher  
  d.   because air is too heavy  
  Hint    
      
  6.What is the most abundant gas in Earth's atmosphere?  
  a.   hydrogen  
  b.   oxygen  
  c.   nitrogen  
  d.   carbon  
  Hint    
      
  7.What is it called when water changes from gas to liquid?  
  a.   melting  
  b.   freezing  
  c.   evaporation  
  d.   condensation  
  Hint    
      
  8.How is the troposphere warmed?  
  a.   The Sun warms Earth's surface, which warms the air above it.  
  b.   The troposphere absorbs sunlight directly.  
  c.   The stratosphere warms it.  
  d.   The gases in the troposphere absorb heat from the Sun.  
  Hint    
      
  9.Force exerted on an area is called __________.  
  a.   mass  
  b.   pressure  
  c.   temperature  
  d.   gravity  
  Hint    
      
  10.What two forms of heat transfer help create a sea breeze?  
  a.   convection and conduction  
  b.   radiation and recycling  
  c.   convection and radiation  
  d.   radiation and conduction  
  Hint    
      
  11.How have humans altered the composition of Earth's atmosphere?  
  a.   They have made the atmospheric temperature drop.  
  b.   They have made the atmospheric pressure drop.  
  c.   They have polluted it with excess ozone.  
  d.   They have polluted it with carbon dioxide gas.  
  Hint    
      
  12.What causes a shooting star?  
  a.   a meteor in the mesosphere  
  b.   a comet in the thermosphere  
  c.   a meteor in the troposphere  
  d.   a comet in the stratosphere  
  Hint    
      
  13.What form of energy transfer heats Earth?  
  a.   conduction  
  b.   recycling  
  c.   convention  
  d.   radiation  
  Hint    
      
  14.How many layers does Earth's atmosphere have?  
  a.   five  
  b.   seven  
  c.   six  
  d.   four  
  Hint    
      
  15.Which layer of the atmosphere contains the ozone layer?  
  a.   troposphere  
  b.   stratosphere  
  c.   exosphere  
  d.   thermosphere  
  Hint    
      
  16.Why are the thermosphere and exosphere the warmest of the atmospheric layers?  
  a.   because of the gases trapped in these layers  
  b.   because they are closest to the Sun  
  c.   because the air pressure is too great  
  d.   because the underlying mesosphere keeps the warm air there  
  Hint    
      
  17.What preceded the growth and survival of green plants on Earth?  
  a.   the formation of the solar system  
  b.   the formation of an ozone layer  
  c.   human life  
  d.   the formation of severe weather  
  Hint    
      
  18.Conduction is the transfer of heat through __________.  
  a.   radiation  
  b.   empty space  
  c.   touch  
  d.   thoughts  
  Hint    
      
  19.How does the atmosphere benefit Earth?  
  a.   It protects Earth from cold air.  
  b.   It creates water.  
  c.   It protects Earth from the Sun's harmful rays.  
  d.   It protects Earth from other planets.  
  Hint    
      
  20.What have CFCs done to Earth and its atmosphere?  
  a.   They have caused the number of cancer cases to rise.  
  b.   They have caused more ultraviolet radiation to reach Earth.  
  c.   They have created a hole in the ozone layer.  
  d.   all answers are correct  
  Hint    

 
   
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