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

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