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Practice Test
  1.Which layer of the atmosphere is named after its high temperature?  
  a.   thermosphere  
  b.   stratosphere  
  c.   troposphere  
  d.   mesosphere  
  2.What two forms of heat transfer help create a sea breeze?  
  a.   convection and conduction  
  b.   radiation and conduction  
  c.   convection and radiation  
  d.   radiation and recycling  
  3.Which layer of the atmosphere contains the ozone layer?  
  a.   troposphere  
  b.   exosphere  
  c.   thermosphere  
  d.   stratosphere  
  4.Where can CFCs be found?  
  a.   aerosol sprays  
  b.   air conditioners  
  c.   all answers are correct  
  d.   refrigerators  
  5.Within which layer of the atmosphere do you find rain, snow, and clouds?  
  a.   troposphere  
  b.   thermosphere  
  c.   mesosphere  
  d.   stratosphere  
  6.How is the troposphere warmed?  
  a.   The stratosphere warms it.  
  b.   The troposphere absorbs sunlight directly.  
  c.   The Sun warms Earth's surface, which warms the air above it.  
  d.   The gases in the troposphere absorb heat from the Sun.  
  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.Why are the thermosphere and exosphere the warmest of the atmospheric layers?  
  a.   because the underlying mesosphere keeps the warm air there  
  b.   because the air pressure is too great  
  c.   because of the gases trapped in these layers  
  d.   because they are closest to the Sun  
  9.The hydrosphere, which consists of all of Earth's water, is maintained __________.  
  a.   by removing water from the atmosphere  
  b.   by recycling water in the atmosphere  
  c.   by addition of water to the atmosphere  
  d.   by the clouds in the atmosphere  
  10.What is it called when water changes from gas to liquid?  
  a.   melting  
  b.   condensation  
  c.   freezing  
  d.   evaporation  
  11.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.  
  12.What would happen if Earth had no atmosphere?  
  a.   The days would be cold and the nights would be hot.  
  b.   Earth would not have days.  
  c.   Earth would not have nights.  
  d.   The days would be hot and the nights would be cold.  
  13.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  
  14.What form of energy transfer heats Earth?  
  a.   conduction  
  b.   radiation  
  c.   recycling  
  d.   convention  
  15.Force exerted on an area is called __________.  
  a.   temperature  
  b.   pressure  
  c.   gravity  
  d.   mass  
  16.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.  
  17.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 decreases as you go higher  
  c.   because air is too heavy  
  d.   because air pressure increases as you go higher  
  18.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 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 carbon atom from a CFC combines with one oxygen from ozone and leaves a two-atom oxygen molecule.  
  19.How many layers does Earth's atmosphere have?  
  a.   seven  
  b.   six  
  c.   five  
  d.   four  
  20.Heat flows from __________.  
  a.   low to high temperature  
  b.   same temperature to same temperature  
  c.   medium to high temperature  
  d.   high to low temperature  

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