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

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