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Practice Test
  1.Conduction is the transfer of heat through __________.  
  a.   touch  
  b.   thoughts  
  c.   radiation  
  d.   empty space  
  2.Which layer of the atmosphere contains the ozone layer?  
  a.   stratosphere  
  b.   exosphere  
  c.   troposphere  
  d.   thermosphere  
  3.What is the most abundant gas in Earth's atmosphere?  
  a.   nitrogen  
  b.   carbon  
  c.   oxygen  
  d.   hydrogen  
  4.What preceded the growth and survival of green plants on Earth?  
  a.   human life  
  b.   the formation of severe weather  
  c.   the formation of an ozone layer  
  d.   the formation of the solar system  
  5.What causes a shooting star?  
  a.   a meteor in the troposphere  
  b.   a meteor in the mesosphere  
  c.   a comet in the thermosphere  
  d.   a comet in the stratosphere  
  6.Why are the thermosphere and exosphere the warmest of the atmospheric layers?  
  a.   because the air pressure is too great  
  b.   because the underlying mesosphere keeps the warm air there  
  c.   because of the gases trapped in these layers  
  d.   because they are closest to the Sun  
  7.Where can CFCs be found?  
  a.   aerosol sprays  
  b.   air conditioners  
  c.   refrigerators  
  d.   all answers are correct  
  8.Heat flows from __________.  
  a.   same temperature to same temperature  
  b.   low to high temperature  
  c.   medium to high temperature  
  d.   high to low temperature  
  9.What have CFCs done to Earth and its atmosphere?  
  a.   They have created a hole in the ozone layer.  
  b.   They have caused the number of cancer cases to rise.  
  c.   all answers are correct  
  d.   They have caused more ultraviolet radiation to reach Earth.  
  10.What two forms of heat transfer help create a sea breeze?  
  a.   convection and radiation  
  b.   radiation and recycling  
  c.   radiation and conduction  
  d.   convection and conduction  
  11.Within which layer of the atmosphere do you find rain, snow, and clouds?  
  a.   stratosphere  
  b.   thermosphere  
  c.   mesosphere  
  d.   troposphere  
  12.What's the difference between ozone and the oxygen you breath?  
  a.   They're made of totally different atoms.  
  b.   Ozone is made of three atoms of oxygen, and the oxygen you breathe is made of two.  
  c.   One is in gas form and the other is in liquid form.  
  d.   Ozone is made of two atoms of oxygen and the oxygen you breath is made of three.  
  13.Which layer of the atmosphere is named after its high temperature?  
  a.   thermosphere  
  b.   mesosphere  
  c.   stratosphere  
  d.   troposphere  
  14.How many layers does Earth's atmosphere have?  
  a.   six  
  b.   seven  
  c.   five  
  d.   four  
  15.What would happen if Earth had no atmosphere?  
  a.   Earth would not have days.  
  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 nights.  
  16.What is it called when water changes from gas to liquid?  
  a.   freezing  
  b.   melting  
  c.   evaporation  
  d.   condensation  
  17.The hydrosphere, which consists of all of Earth's water, is maintained __________.  
  a.   by recycling water in the atmosphere  
  b.   by addition of water to the atmosphere  
  c.   by removing water from the atmosphere  
  d.   by the clouds in the atmosphere  
  18.How does the atmosphere benefit Earth?  
  a.   It protects Earth from the Sun's harmful rays.  
  b.   It protects Earth from cold air.  
  c.   It creates water.  
  d.   It protects Earth from other planets.  
  19.How do CFCs destroy ozone?  
  a.   A CFC combines with a three-atom oxygen molecule.  
  b.   A chlorine atom from a CFC combines with two oxygen atoms from ozone and leaves an oxygen atom.  
  c.   A chlorine atom from a CFC combines with one oxygen from ozone and leaves a two- atom oxygen molecule.  
  d.   A carbon atom from a CFC combines with one oxygen from ozone and leaves a two-atom oxygen molecule.  
  20.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.  

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