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Practice Test
  1.What have CFCs done to Earth and its atmosphere?  
  a.   They have created a hole in the ozone layer.  
  b.   all answers are correct  
  c.   They have caused the number of cancer cases to rise.  
  d.   They have caused more ultraviolet radiation to reach Earth.  
  2.How does the atmosphere benefit Earth?  
  a.   It protects Earth from other planets.  
  b.   It creates water.  
  c.   It protects Earth from cold air.  
  d.   It protects Earth from the Sun's harmful rays.  
  3.Why are the thermosphere and exosphere the warmest of the atmospheric layers?  
  a.   because the air pressure is too great  
  b.   because they are closest to the Sun  
  c.   because of the gases trapped in these layers  
  d.   because the underlying mesosphere keeps the warm air there  
  4.What is the outermost layer of the atmosphere called?  
  a.   exosphere  
  b.   thermosphere  
  c.   mesosphere  
  d.   stratosphere  
  5.How have humans altered the composition of Earth's atmosphere?  
  a.   They have polluted it with excess ozone.  
  b.   They have made the atmospheric pressure drop.  
  c.   They have polluted it with carbon dioxide gas.  
  d.   They have made the atmospheric temperature drop.  
  6.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  
  7.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.  
  8.Heat flows from __________.  
  a.   high to low temperature  
  b.   same temperature to same temperature  
  c.   medium to high temperature  
  d.   low to high temperature  
  9.Where can CFCs be found?  
  a.   all answers are correct  
  b.   refrigerators  
  c.   air conditioners  
  d.   aerosol sprays  
  10.Force exerted on an area is called __________.  
  a.   temperature  
  b.   mass  
  c.   pressure  
  d.   gravity  
  11.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.  
  12.Which layer of the atmosphere contains the ozone layer?  
  a.   troposphere  
  b.   thermosphere  
  c.   exosphere  
  d.   stratosphere  
  13.What is it called when water changes from gas to liquid?  
  a.   condensation  
  b.   melting  
  c.   evaporation  
  d.   freezing  
  14.Conduction is the transfer of heat through __________.  
  a.   touch  
  b.   empty space  
  c.   thoughts  
  d.   radiation  
  15.Why are there fewer molecules of air up in the mountains?  
  a.   because air pressure increases as you go higher  
  b.   because air pressure decreases as you go higher  
  c.   because air is too heavy  
  d.   because air pressure is the same throughout all layers of the atmosphere  
  16.The hydrosphere, which consists of all of Earth's water, is maintained __________.  
  a.   by recycling water in the atmosphere  
  b.   by the clouds in the atmosphere  
  c.   by addition of water to the atmosphere  
  d.   by removing water from the atmosphere  
  17.How is the troposphere warmed?  
  a.   The gases in the troposphere absorb heat from the Sun.  
  b.   The stratosphere warms it.  
  c.   The troposphere absorbs sunlight directly.  
  d.   The Sun warms Earth's surface, which warms the air above it.  
  18.What preceded the growth and survival of green plants on Earth?  
  a.   the formation of an ozone layer  
  b.   human life  
  c.   the formation of the solar system  
  d.   the formation of severe weather  
  19.How many layers does Earth's atmosphere have?  
  a.   five  
  b.   six  
  c.   seven  
  d.   four  
  20.What causes a shooting star?  
  a.   a meteor in the mesosphere  
  b.   a comet in the stratosphere  
  c.   a meteor in the troposphere  
  d.   a comet in the thermosphere  

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