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Practice Test
  1.Which layer of the atmosphere is named after its high temperature?  
  a.   stratosphere  
  b.   thermosphere  
  c.   mesosphere  
  d.   troposphere  
  2.Where can CFCs be found?  
  a.   air conditioners  
  b.   refrigerators  
  c.   all answers are correct  
  d.   aerosol sprays  
  3.What is the outermost layer of the atmosphere called?  
  a.   stratosphere  
  b.   mesosphere  
  c.   exosphere  
  d.   thermosphere  
  4.What have CFCs done to Earth and its atmosphere?  
  a.   all answers are correct  
  b.   They have caused the number of cancer cases to rise.  
  c.   They have caused more ultraviolet radiation to reach Earth.  
  d.   They have created a hole in the ozone layer.  
  5.Conduction is the transfer of heat through __________.  
  a.   empty space  
  b.   radiation  
  c.   touch  
  d.   thoughts  
  6.Why are the thermosphere and exosphere the warmest of the atmospheric layers?  
  a.   because the underlying mesosphere keeps the warm air there  
  b.   because they are closest to the Sun  
  c.   because the air pressure is too great  
  d.   because of the gases trapped in these layers  
  7.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.  
  8.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 CFC combines with a three-atom oxygen molecule.  
  c.   A chlorine 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.  
  9.What would happen if Earth had no atmosphere?  
  a.   The days would be hot and the nights would be cold.  
  b.   Earth would not have days.  
  c.   Earth would not have nights.  
  d.   The days would be cold and the nights would be hot.  
  10.The hydrosphere, which consists of all of Earth's water, is maintained __________.  
  a.   by addition of water to the atmosphere  
  b.   by the clouds in the atmosphere  
  c.   by removing water from the atmosphere  
  d.   by recycling water in the atmosphere  
  11.What is the most abundant gas in Earth's atmosphere?  
  a.   hydrogen  
  b.   oxygen  
  c.   carbon  
  d.   nitrogen  
  12.How many layers does Earth's atmosphere have?  
  a.   four  
  b.   six  
  c.   seven  
  d.   five  
  13.What preceded the growth and survival of green plants on Earth?  
  a.   the formation of severe weather  
  b.   human life  
  c.   the formation of an ozone layer  
  d.   the formation of the solar system  
  14.Why are there fewer molecules of air up in the mountains?  
  a.   because air pressure increases as you go higher  
  b.   because air pressure decreases as you go higher  
  c.   because air is too heavy  
  d.   because air pressure is the same throughout all layers of the atmosphere  
  15.Force exerted on an area is called __________.  
  a.   pressure  
  b.   gravity  
  c.   mass  
  d.   temperature  
  16.How does the atmosphere benefit Earth?  
  a.   It creates water.  
  b.   It protects Earth from other planets.  
  c.   It protects Earth from the Sun's harmful rays.  
  d.   It protects Earth from cold air.  
  17.How is the troposphere warmed?  
  a.   The troposphere absorbs sunlight directly.  
  b.   The stratosphere warms it.  
  c.   The gases in the troposphere absorb heat from the Sun.  
  d.   The Sun warms Earth's surface, which warms the air above it.  
  18.What form of energy transfer heats Earth?  
  a.   conduction  
  b.   radiation  
  c.   recycling  
  d.   convention  
  19.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.  
  20.Within which layer of the atmosphere do you find rain, snow, and clouds?  
  a.   thermosphere  
  b.   stratosphere  
  c.   troposphere  
  d.   mesosphere  

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