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Practice Test
  1.What is the most abundant gas in Earth's atmosphere?  
  a.   hydrogen  
  b.   nitrogen  
  c.   oxygen  
  d.   carbon  
  2.Force exerted on an area is called __________.  
  a.   gravity  
  b.   mass  
  c.   temperature  
  d.   pressure  
  3.How have humans altered the composition of Earth's atmosphere?  
  a.   They have made the atmospheric temperature drop.  
  b.   They have polluted it with carbon dioxide gas.  
  c.   They have polluted it with excess ozone.  
  d.   They have made the atmospheric pressure drop.  
  4.How many layers does Earth's atmosphere have?  
  a.   seven  
  b.   six  
  c.   five  
  d.   four  
  5.What is the outermost layer of the atmosphere called?  
  a.   stratosphere  
  b.   exosphere  
  c.   thermosphere  
  d.   mesosphere  
  6.Conduction is the transfer of heat through __________.  
  a.   touch  
  b.   thoughts  
  c.   radiation  
  d.   empty space  
  7.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 created a hole in the ozone layer.  
  d.   They have caused the number of cancer cases to rise.  
  8.Heat flows from __________.  
  a.   low to high temperature  
  b.   same temperature to same temperature  
  c.   medium to high temperature  
  d.   high to low temperature  
  9.The hydrosphere, which consists of all of Earth's water, is maintained __________.  
  a.   by recycling water in the atmosphere  
  b.   by addition of water to the atmosphere  
  c.   by removing water from the atmosphere  
  d.   by the clouds in the atmosphere  
  10.What causes a shooting star?  
  a.   a comet in the stratosphere  
  b.   a comet in the thermosphere  
  c.   a meteor in the troposphere  
  d.   a meteor in the mesosphere  
  11.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.   They're made of totally different atoms.  
  d.   Ozone is made of three atoms of oxygen, and the oxygen you breathe is made of two.  
  12.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.  
  13.What form of energy transfer heats Earth?  
  a.   convention  
  b.   radiation  
  c.   recycling  
  d.   conduction  
  14.What preceded the growth and survival of green plants on Earth?  
  a.   the formation of severe weather  
  b.   the formation of an ozone layer  
  c.   the formation of the solar system  
  d.   human life  
  15.What two forms of heat transfer help create a sea breeze?  
  a.   radiation and conduction  
  b.   convection and radiation  
  c.   convection and conduction  
  d.   radiation and recycling  
  16.Why are there fewer molecules of air up in the mountains?  
  a.   because air pressure decreases as you go higher  
  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 is too heavy  
  17.Where can CFCs be found?  
  a.   refrigerators  
  b.   all answers are correct  
  c.   aerosol sprays  
  d.   air conditioners  
  18.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  
  19.What is it called when water changes from gas to liquid?  
  a.   evaporation  
  b.   freezing  
  c.   condensation  
  d.   melting  
  20.Which layer of the atmosphere contains the ozone layer?  
  a.   stratosphere  
  b.   troposphere  
  c.   exosphere  
  d.   thermosphere  

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