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Practice Test
  1.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 chlorine atom from a CFC combines with two oxygen atoms from ozone and leaves an oxygen atom.  
  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.  
  2.Why are there fewer molecules of air up in the mountains?  
  a.   because air pressure is the same throughout all layers of the atmosphere  
  b.   because air pressure increases as you go higher  
  c.   because air is too heavy  
  d.   because air pressure decreases as you go higher  
  3.What is the most abundant gas in Earth's atmosphere?  
  a.   hydrogen  
  b.   oxygen  
  c.   nitrogen  
  d.   carbon  
  4.What is it called when water changes from gas to liquid?  
  a.   condensation  
  b.   freezing  
  c.   melting  
  d.   evaporation  
  5.Which layer of the atmosphere contains the ozone layer?  
  a.   troposphere  
  b.   exosphere  
  c.   stratosphere  
  d.   thermosphere  
  6.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 more ultraviolet radiation to reach Earth.  
  d.   They have caused the number of cancer cases to rise.  
  7.What causes a shooting star?  
  a.   a comet in the thermosphere  
  b.   a meteor in the mesosphere  
  c.   a comet in the stratosphere  
  d.   a meteor in the troposphere  
  8.Which layer of the atmosphere is named after its high temperature?  
  a.   thermosphere  
  b.   stratosphere  
  c.   mesosphere  
  d.   troposphere  
  9.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 two atoms of oxygen and the oxygen you breath is made of three.  
  c.   Ozone is made of three atoms of oxygen, and the oxygen you breathe is made of two.  
  d.   They're made of totally different atoms.  
  10.Conduction is the transfer of heat through __________.  
  a.   radiation  
  b.   touch  
  c.   thoughts  
  d.   empty space  
  11.How many layers does Earth's atmosphere have?  
  a.   five  
  b.   four  
  c.   seven  
  d.   six  
  12.Heat flows from __________.  
  a.   medium to high temperature  
  b.   low to high temperature  
  c.   high to low temperature  
  d.   same temperature to same temperature  
  13.What form of energy transfer heats Earth?  
  a.   recycling  
  b.   convention  
  c.   radiation  
  d.   conduction  
  14.What preceded the growth and survival of green plants on Earth?  
  a.   human life  
  b.   the formation of severe weather  
  c.   the formation of the solar system  
  d.   the formation of an ozone layer  
  15.The hydrosphere, which consists of all of Earth's water, is maintained __________.  
  a.   by addition of water to the atmosphere  
  b.   by recycling water in the atmosphere  
  c.   by removing water from the atmosphere  
  d.   by the clouds in the atmosphere  
  16.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 the underlying mesosphere keeps the warm air there  
  d.   because of the gases trapped in these layers  
  17.What two forms of heat transfer help create a sea breeze?  
  a.   convection and conduction  
  b.   convection and radiation  
  c.   radiation and recycling  
  d.   radiation and conduction  
  18.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.  
  19.What would happen if Earth had no atmosphere?  
  a.   The days would be hot and the nights would be cold.  
  b.   The days would be cold and the nights would be hot.  
  c.   Earth would not have days.  
  d.   Earth would not have nights.  
  20.Within which layer of the atmosphere do you find rain, snow, and clouds?  
  a.   troposphere  
  b.   mesosphere  
  c.   stratosphere  
  d.   thermosphere  

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