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Practice Test
  1.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.   They're made of totally different atoms.  
  d.   Ozone is made of two atoms of oxygen and the oxygen you breath is made of three.  
  2.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.  
  3.What preceded the growth and survival of green plants on Earth?  
  a.   the formation of an ozone layer  
  b.   the formation of the solar system  
  c.   the formation of severe weather  
  d.   human life  
  4.What is it called when water changes from gas to liquid?  
  a.   condensation  
  b.   melting  
  c.   freezing  
  d.   evaporation  
  5.Which layer of the atmosphere contains the ozone layer?  
  a.   exosphere  
  b.   troposphere  
  c.   thermosphere  
  d.   stratosphere  
  6.What is the outermost layer of the atmosphere called?  
  a.   stratosphere  
  b.   exosphere  
  c.   thermosphere  
  d.   mesosphere  
  7.How is the troposphere warmed?  
  a.   The stratosphere warms it.  
  b.   The Sun warms Earth's surface, which warms the air above it.  
  c.   The troposphere absorbs sunlight directly.  
  d.   The gases in the troposphere absorb heat from the Sun.  
  8.Where can CFCs be found?  
  a.   air conditioners  
  b.   refrigerators  
  c.   aerosol sprays  
  d.   all answers are correct  
  9.What form of energy transfer heats Earth?  
  a.   radiation  
  b.   recycling  
  c.   conduction  
  d.   convention  
  10.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.  
  11.What would happen if Earth had no atmosphere?  
  a.   Earth would not have nights.  
  b.   The days would be hot and the nights would be cold.  
  c.   The days would be cold and the nights would be hot.  
  d.   Earth would not have days.  
  12.What is the most abundant gas in Earth's atmosphere?  
  a.   hydrogen  
  b.   carbon  
  c.   oxygen  
  d.   nitrogen  
  13.Why are the thermosphere and exosphere the warmest of the atmospheric layers?  
  a.   because the underlying mesosphere keeps the warm air there  
  b.   because they are closest to the Sun  
  c.   because of the gases trapped in these layers  
  d.   because the air pressure is too great  
  14.How have humans altered the composition of Earth's atmosphere?  
  a.   They have made the atmospheric pressure drop.  
  b.   They have made the atmospheric temperature drop.  
  c.   They have polluted it with excess ozone.  
  d.   They have polluted it with carbon dioxide gas.  
  15.Conduction is the transfer of heat through __________.  
  a.   touch  
  b.   thoughts  
  c.   empty space  
  d.   radiation  
  16.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 chlorine atom from a CFC combines with two oxygen atoms from ozone and leaves an oxygen atom.  
  d.   A carbon atom from a CFC combines with one oxygen from ozone and leaves a two-atom oxygen molecule.  
  17.Force exerted on an area is called __________.  
  a.   mass  
  b.   gravity  
  c.   pressure  
  d.   temperature  
  18.Which layer of the atmosphere is named after its high temperature?  
  a.   thermosphere  
  b.   mesosphere  
  c.   stratosphere  
  d.   troposphere  
  19.What causes a shooting star?  
  a.   a meteor in the mesosphere  
  b.   a meteor in the troposphere  
  c.   a comet in the thermosphere  
  d.   a comet in the stratosphere  
  20.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  

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