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Practice Test
  1.Which layer of the atmosphere is named after its high temperature?  
  a.   mesosphere  
  b.   thermosphere  
  c.   stratosphere  
  d.   troposphere  
  2.Within which layer of the atmosphere do you find rain, snow, and clouds?  
  a.   thermosphere  
  b.   mesosphere  
  c.   stratosphere  
  d.   troposphere  
  3.Where can CFCs be found?  
  a.   air conditioners  
  b.   refrigerators  
  c.   all answers are correct  
  d.   aerosol sprays  
  4.What have CFCs done to Earth and its atmosphere?  
  a.   They have caused the number of cancer cases to rise.  
  b.   all answers are correct  
  c.   They have created a hole in the ozone layer.  
  d.   They have caused more ultraviolet radiation to reach Earth.  
  5.What is it called when water changes from gas to liquid?  
  a.   evaporation  
  b.   freezing  
  c.   melting  
  d.   condensation  
  6.Conduction is the transfer of heat through __________.  
  a.   touch  
  b.   radiation  
  c.   empty space  
  d.   thoughts  
  7.What is the most abundant gas in Earth's atmosphere?  
  a.   nitrogen  
  b.   hydrogen  
  c.   carbon  
  d.   oxygen  
  8.What preceded the growth and survival of green plants on Earth?  
  a.   the formation of an ozone layer  
  b.   human life  
  c.   the formation of severe weather  
  d.   the formation of the solar system  
  9.Which layer of the atmosphere contains the ozone layer?  
  a.   thermosphere  
  b.   stratosphere  
  c.   exosphere  
  d.   troposphere  
  10.What causes a shooting star?  
  a.   a meteor in the mesosphere  
  b.   a comet in the thermosphere  
  c.   a meteor in the troposphere  
  d.   a comet in the stratosphere  
  11.How many layers does Earth's atmosphere have?  
  a.   seven  
  b.   six  
  c.   four  
  d.   five  
  12.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 is the same throughout all layers of the atmosphere  
  d.   because air pressure decreases as you go higher  
  13.What would happen if Earth had no atmosphere?  
  a.   Earth would not have days.  
  b.   The days would be hot and the nights would be cold.  
  c.   The days would be cold and the nights would be hot.  
  d.   Earth would not have nights.  
  14.How is the troposphere warmed?  
  a.   The gases in the troposphere absorb heat from the Sun.  
  b.   The troposphere absorbs sunlight directly.  
  c.   The stratosphere warms it.  
  d.   The Sun warms Earth's surface, which warms the air above it.  
  15.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 cold air.  
  d.   It protects Earth from other planets.  
  16.How do CFCs destroy ozone?  
  a.   A chlorine atom from a CFC combines with two oxygen atoms from ozone and leaves an oxygen atom.  
  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 CFC combines with a three-atom oxygen molecule.  
  17.Force exerted on an area is called __________.  
  a.   gravity  
  b.   temperature  
  c.   pressure  
  d.   mass  
  18.How have humans altered the composition of Earth's atmosphere?  
  a.   They have made the atmospheric pressure drop.  
  b.   They have polluted it with carbon dioxide gas.  
  c.   They have polluted it with excess ozone.  
  d.   They have made the atmospheric temperature drop.  
  19.What form of energy transfer heats Earth?  
  a.   recycling  
  b.   radiation  
  c.   convention  
  d.   conduction  
  20.Heat flows from __________.  
  a.   medium to high temperature  
  b.   high to low temperature  
  c.   low to high temperature  
  d.   same temperature to same temperature  

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