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Practice Test
  1.How is the troposphere warmed?  
  a.   The troposphere absorbs sunlight directly.  
  b.   The stratosphere warms it.  
  c.   The gases in the troposphere absorb heat from the Sun.  
  d.   The Sun warms Earth's surface, which warms the air above it.  
  2.How have humans altered the composition of Earth's atmosphere?  
  a.   They have made the atmospheric pressure drop.  
  b.   They have polluted it with excess ozone.  
  c.   They have polluted it with carbon dioxide gas.  
  d.   They have made the atmospheric temperature drop.  
  3.Why are the thermosphere and exosphere the warmest of the atmospheric layers?  
  a.   because they are closest to the Sun  
  b.   because the underlying mesosphere keeps the warm air there  
  c.   because the air pressure is too great  
  d.   because of the gases trapped in these layers  
  4.Why are there fewer molecules of air up in the mountains?  
  a.   because air is too heavy  
  b.   because air pressure increases as you go higher  
  c.   because air pressure decreases as you go higher  
  d.   because air pressure is the same throughout all layers of the atmosphere  
  5.What is it called when water changes from gas to liquid?  
  a.   condensation  
  b.   freezing  
  c.   evaporation  
  d.   melting  
  6.What is the most abundant gas in Earth's atmosphere?  
  a.   carbon  
  b.   hydrogen  
  c.   nitrogen  
  d.   oxygen  
  7.How does the atmosphere benefit Earth?  
  a.   It protects Earth from the Sun's harmful rays.  
  b.   It creates water.  
  c.   It protects Earth from other planets.  
  d.   It protects Earth from cold air.  
  8.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 carbon atom from a CFC combines with one oxygen from ozone and leaves a two-atom oxygen molecule.  
  d.   A chlorine atom from a CFC combines with two oxygen atoms from ozone and leaves an oxygen atom.  
  9.What is the outermost layer of the atmosphere called?  
  a.   mesosphere  
  b.   thermosphere  
  c.   stratosphere  
  d.   exosphere  
  10.How many layers does Earth's atmosphere have?  
  a.   seven  
  b.   five  
  c.   six  
  d.   four  
  11.Where can CFCs be found?  
  a.   air conditioners  
  b.   all answers are correct  
  c.   aerosol sprays  
  d.   refrigerators  
  12.What form of energy transfer heats Earth?  
  a.   convention  
  b.   recycling  
  c.   conduction  
  d.   radiation  
  13.What two forms of heat transfer help create a sea breeze?  
  a.   convection and conduction  
  b.   radiation and conduction  
  c.   convection and radiation  
  d.   radiation and recycling  
  14.What have CFCs done to Earth and its atmosphere?  
  a.   all answers are correct  
  b.   They have created a hole in the ozone layer.  
  c.   They have caused the number of cancer cases to rise.  
  d.   They have caused more ultraviolet radiation to reach Earth.  
  15.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 an ozone layer  
  d.   the formation of severe weather  
  16.What would happen if Earth had no atmosphere?  
  a.   Earth would not have days.  
  b.   The days would be cold and the nights would be hot.  
  c.   Earth would not have nights.  
  d.   The days would be hot and the nights would be cold.  
  17.The hydrosphere, which consists of all of Earth's water, is maintained __________.  
  a.   by removing water from the atmosphere  
  b.   by recycling water in the atmosphere  
  c.   by addition of water to the atmosphere  
  d.   by the clouds in the atmosphere  
  18.Force exerted on an area is called __________.  
  a.   gravity  
  b.   mass  
  c.   temperature  
  d.   pressure  
  19.Conduction is the transfer of heat through __________.  
  a.   empty space  
  b.   touch  
  c.   radiation  
  d.   thoughts  
  20.Which layer of the atmosphere contains the ozone layer?  
  a.   exosphere  
  b.   stratosphere  
  c.   troposphere  
  d.   thermosphere  

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