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Practice Test
  1.How many layers does Earth's atmosphere have?  
  a.   four  
  b.   six  
  c.   five  
  d.   seven  
  2.How have humans altered the composition of Earth's atmosphere?  
  a.   They have made the atmospheric temperature drop.  
  b.   They have polluted it with carbon dioxide gas.  
  c.   They have polluted it with excess ozone.  
  d.   They have made the atmospheric pressure drop.  
  3.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.  
  4.Heat flows from __________.  
  a.   high to low temperature  
  b.   low to high temperature  
  c.   same temperature to same temperature  
  d.   medium to high temperature  
  5.What is the most abundant gas in Earth's atmosphere?  
  a.   carbon  
  b.   hydrogen  
  c.   nitrogen  
  d.   oxygen  
  6.Where can CFCs be found?  
  a.   all answers are correct  
  b.   aerosol sprays  
  c.   refrigerators  
  d.   air conditioners  
  7.What is it called when water changes from gas to liquid?  
  a.   condensation  
  b.   evaporation  
  c.   freezing  
  d.   melting  
  8.How is the troposphere warmed?  
  a.   The Sun warms Earth's surface, which warms the air above it.  
  b.   The gases in the troposphere absorb heat from the Sun.  
  c.   The troposphere absorbs sunlight directly.  
  d.   The stratosphere warms it.  
  9.Force exerted on an area is called __________.  
  a.   pressure  
  b.   temperature  
  c.   mass  
  d.   gravity  
  10.Which layer of the atmosphere contains the ozone layer?  
  a.   exosphere  
  b.   troposphere  
  c.   stratosphere  
  d.   thermosphere  
  11.Within which layer of the atmosphere do you find rain, snow, and clouds?  
  a.   mesosphere  
  b.   stratosphere  
  c.   thermosphere  
  d.   troposphere  
  12.What form of energy transfer heats Earth?  
  a.   radiation  
  b.   recycling  
  c.   convention  
  d.   conduction  
  13.Conduction is the transfer of heat through __________.  
  a.   radiation  
  b.   empty space  
  c.   thoughts  
  d.   touch  
  14.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 carbon atom from a CFC combines with one oxygen from ozone and leaves a two-atom oxygen molecule.  
  c.   A chlorine atom from a CFC combines with two oxygen atoms from ozone and leaves an oxygen atom.  
  d.   A CFC combines with a three-atom oxygen molecule.  
  15.What two forms of heat transfer help create a sea breeze?  
  a.   convection and conduction  
  b.   radiation and recycling  
  c.   radiation and conduction  
  d.   convection and radiation  
  16.What have CFCs done to Earth and its atmosphere?  
  a.   all answers are correct  
  b.   They have caused more ultraviolet radiation to reach Earth.  
  c.   They have caused the number of cancer cases to rise.  
  d.   They have created a hole in the ozone layer.  
  17.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.  
  18.What is the outermost layer of the atmosphere called?  
  a.   exosphere  
  b.   thermosphere  
  c.   stratosphere  
  d.   mesosphere  
  19.What preceded the growth and survival of green plants on Earth?  
  a.   human life  
  b.   the formation of the solar system  
  c.   the formation of severe weather  
  d.   the formation of an ozone layer  
  20.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 days.  
  d.   Earth would not have nights.  

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