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

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