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Practice Test
  1.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.   human life  
  d.   the formation of the solar system  
  2.Heat flows from __________.  
  a.   same temperature to same temperature  
  b.   low to high temperature  
  c.   high to low temperature  
  d.   medium to high temperature  
  3.How have humans altered the composition of Earth's atmosphere?  
  a.   They have made the atmospheric pressure drop.  
  b.   They have made the atmospheric temperature drop.  
  c.   They have polluted it with carbon dioxide gas.  
  d.   They have polluted it with excess ozone.  
  4.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 two oxygen atoms from ozone and leaves an oxygen atom.  
  c.   A chlorine 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.  
  5.How does the atmosphere benefit Earth?  
  a.   It protects Earth from the Sun's harmful rays.  
  b.   It protects Earth from other planets.  
  c.   It creates water.  
  d.   It protects Earth from cold air.  
  6.What causes a shooting star?  
  a.   a comet in the thermosphere  
  b.   a comet in the stratosphere  
  c.   a meteor in the mesosphere  
  d.   a meteor in the troposphere  
  7.The hydrosphere, which consists of all of Earth's water, is maintained __________.  
  a.   by the clouds in the atmosphere  
  b.   by removing water from the atmosphere  
  c.   by addition of water to the atmosphere  
  d.   by recycling water in the atmosphere  
  8.Where can CFCs be found?  
  a.   aerosol sprays  
  b.   all answers are correct  
  c.   refrigerators  
  d.   air conditioners  
  9.How is the troposphere warmed?  
  a.   The gases in the troposphere absorb heat from the Sun.  
  b.   The troposphere absorbs sunlight directly.  
  c.   The Sun warms Earth's surface, which warms the air above it.  
  d.   The stratosphere warms it.  
  10.What have CFCs done to Earth and its atmosphere?  
  a.   They have created a hole in the ozone layer.  
  b.   They have caused the number of cancer cases to rise.  
  c.   They have caused more ultraviolet radiation to reach Earth.  
  d.   all answers are correct  
  11.What two forms of heat transfer help create a sea breeze?  
  a.   convection and radiation  
  b.   radiation and conduction  
  c.   convection and conduction  
  d.   radiation and recycling  
  12.Force exerted on an area is called __________.  
  a.   mass  
  b.   temperature  
  c.   pressure  
  d.   gravity  
  13.What is the most abundant gas in Earth's atmosphere?  
  a.   carbon  
  b.   oxygen  
  c.   nitrogen  
  d.   hydrogen  
  14.What is it called when water changes from gas to liquid?  
  a.   evaporation  
  b.   melting  
  c.   freezing  
  d.   condensation  
  15.How many layers does Earth's atmosphere have?  
  a.   four  
  b.   five  
  c.   seven  
  d.   six  
  16.Conduction is the transfer of heat through __________.  
  a.   radiation  
  b.   empty space  
  c.   thoughts  
  d.   touch  
  17.Which layer of the atmosphere contains the ozone layer?  
  a.   thermosphere  
  b.   troposphere  
  c.   exosphere  
  d.   stratosphere  
  18.What's the difference between ozone and the oxygen you breath?  
  a.   They're made of totally different atoms.  
  b.   Ozone is made of three atoms of oxygen, and the oxygen you breathe is made of two.  
  c.   One is in gas form and the other is in liquid form.  
  d.   Ozone is made of two atoms of oxygen and the oxygen you breath is made of three.  
  19.What form of energy transfer heats Earth?  
  a.   conduction  
  b.   recycling  
  c.   radiation  
  d.   convention  
  20.Why are the thermosphere and exosphere the warmest of the atmospheric layers?  
  a.   because of the gases trapped in these layers  
  b.   because they are closest to the Sun  
  c.   because the air pressure is too great  
  d.   because the underlying mesosphere keeps the warm air there  

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