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Practice Test
  1.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.  
  2.Conduction is the transfer of heat through __________.  
  a.   thoughts  
  b.   touch  
  c.   radiation  
  d.   empty space  
  3.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.   They're made of totally different atoms.  
  c.   Ozone is made of two atoms of oxygen and the oxygen you breath is made of three.  
  d.   One is in gas form and the other is in liquid form.  
  4.What is the outermost layer of the atmosphere called?  
  a.   exosphere  
  b.   thermosphere  
  c.   stratosphere  
  d.   mesosphere  
  5.How have humans altered the composition of Earth's atmosphere?  
  a.   They have made the atmospheric temperature drop.  
  b.   They have polluted it with excess ozone.  
  c.   They have polluted it with carbon dioxide gas.  
  d.   They have made the atmospheric pressure drop.  
  6.What preceded the growth and survival of green plants on Earth?  
  a.   the formation of an ozone layer  
  b.   the formation of severe weather  
  c.   the formation of the solar system  
  d.   human life  
  7.Where can CFCs be found?  
  a.   refrigerators  
  b.   aerosol sprays  
  c.   all answers are correct  
  d.   air conditioners  
  8.Which layer of the atmosphere is named after its high temperature?  
  a.   troposphere  
  b.   stratosphere  
  c.   thermosphere  
  d.   mesosphere  
  9.What two forms of heat transfer help create a sea breeze?  
  a.   radiation and conduction  
  b.   convection and conduction  
  c.   radiation and recycling  
  d.   convection and radiation  
  10.Within which layer of the atmosphere do you find rain, snow, and clouds?  
  a.   thermosphere  
  b.   troposphere  
  c.   stratosphere  
  d.   mesosphere  
  11.How do CFCs destroy ozone?  
  a.   A CFC combines with a three-atom oxygen molecule.  
  b.   A chlorine atom from a CFC combines with one oxygen from ozone and leaves a two- 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.  
  12.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  
  13.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 decreases as you go higher  
  c.   because air pressure increases as you go higher  
  d.   because air is too heavy  
  14.Heat flows from __________.  
  a.   same temperature to same temperature  
  b.   high to low temperature  
  c.   medium to high temperature  
  d.   low to high temperature  
  15.What is it called when water changes from gas to liquid?  
  a.   melting  
  b.   freezing  
  c.   evaporation  
  d.   condensation  
  16.What form of energy transfer heats Earth?  
  a.   conduction  
  b.   recycling  
  c.   radiation  
  d.   convention  
  17.Force exerted on an area is called __________.  
  a.   gravity  
  b.   pressure  
  c.   mass  
  d.   temperature  
  18.The hydrosphere, which consists of all of Earth's water, is maintained __________.  
  a.   by removing water from the atmosphere  
  b.   by the clouds in the atmosphere  
  c.   by recycling water in the atmosphere  
  d.   by addition of water to the atmosphere  
  19.What causes a shooting star?  
  a.   a comet in the stratosphere  
  b.   a meteor in the mesosphere  
  c.   a meteor in the troposphere  
  d.   a comet in the thermosphere  
  20.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.  

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