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Practice Test
  1.What is the outermost layer of the atmosphere called?  
  a.   stratosphere  
  b.   exosphere  
  c.   thermosphere  
  d.   mesosphere  
  2.What's the difference between ozone and the oxygen you breath?  
  a.   Ozone is made of three atoms of oxygen, and the oxygen you breathe is made of two.  
  b.   One is in gas form and the other is in liquid form.  
  c.   Ozone is made of two atoms of oxygen and the oxygen you breath is made of three.  
  d.   They're made of totally different atoms.  
  3.Why are there fewer molecules of air up in the mountains?  
  a.   because air is too heavy  
  b.   because air pressure decreases as you go higher  
  c.   because air pressure is the same throughout all layers of the atmosphere  
  d.   because air pressure increases as you go higher  
  4.What form of energy transfer heats Earth?  
  a.   convention  
  b.   conduction  
  c.   radiation  
  d.   recycling  
  5.What is it called when water changes from gas to liquid?  
  a.   evaporation  
  b.   condensation  
  c.   freezing  
  d.   melting  
  6.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.  
  7.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 chlorine atom from a CFC combines with two oxygen atoms from ozone and leaves an oxygen atom.  
  c.   A CFC combines with a three-atom oxygen molecule.  
  d.   A carbon atom from a CFC combines with one oxygen from ozone and leaves a two-atom oxygen molecule.  
  8.Heat flows from __________.  
  a.   same temperature to same temperature  
  b.   medium to high temperature  
  c.   high to low temperature  
  d.   low to high temperature  
  9.Why are the thermosphere and exosphere the warmest of the atmospheric layers?  
  a.   because they are closest to the Sun  
  b.   because of the gases trapped in these layers  
  c.   because the air pressure is too great  
  d.   because the underlying mesosphere keeps the warm air there  
  10.Where can CFCs be found?  
  a.   all answers are correct  
  b.   aerosol sprays  
  c.   refrigerators  
  d.   air conditioners  
  11.How many layers does Earth's atmosphere have?  
  a.   four  
  b.   five  
  c.   six  
  d.   seven  
  12.The hydrosphere, which consists of all of Earth's water, is maintained __________.  
  a.   by the clouds in the atmosphere  
  b.   by addition of water to the atmosphere  
  c.   by removing water from the atmosphere  
  d.   by recycling water in the atmosphere  
  13.What causes a shooting star?  
  a.   a comet in the stratosphere  
  b.   a meteor in the mesosphere  
  c.   a comet in the thermosphere  
  d.   a meteor in the troposphere  
  14.Force exerted on an area is called __________.  
  a.   pressure  
  b.   mass  
  c.   temperature  
  d.   gravity  
  15.Conduction is the transfer of heat through __________.  
  a.   radiation  
  b.   empty space  
  c.   touch  
  d.   thoughts  
  16.What have CFCs done to Earth and its atmosphere?  
  a.   They have caused the number of cancer cases to rise.  
  b.   They have created a hole in the ozone layer.  
  c.   all answers are correct  
  d.   They have caused more ultraviolet radiation to reach Earth.  
  17.How does the atmosphere benefit Earth?  
  a.   It protects Earth from cold air.  
  b.   It creates water.  
  c.   It protects Earth from other planets.  
  d.   It protects Earth from the Sun's harmful rays.  
  18.Which layer of the atmosphere contains the ozone layer?  
  a.   troposphere  
  b.   stratosphere  
  c.   thermosphere  
  d.   exosphere  
  19.Within which layer of the atmosphere do you find rain, snow, and clouds?  
  a.   thermosphere  
  b.   stratosphere  
  c.   troposphere  
  d.   mesosphere  
  20.What two forms of heat transfer help create a sea breeze?  
  a.   convection and radiation  
  b.   radiation and conduction  
  c.   convection and conduction  
  d.   radiation and recycling  

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