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Practice Test
  1.How does the atmosphere benefit Earth?  
  a.   It protects Earth from cold air.  
  b.   It protects Earth from other planets.  
  c.   It creates water.  
  d.   It protects Earth from the Sun's harmful rays.  
  2.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.  
  3.Why are the thermosphere and exosphere the warmest of the atmospheric layers?  
  a.   because the air pressure is too great  
  b.   because of the gases trapped in these layers  
  c.   because the underlying mesosphere keeps the warm air there  
  d.   because they are closest to the Sun  
  4.What is the most abundant gas in Earth's atmosphere?  
  a.   hydrogen  
  b.   carbon  
  c.   nitrogen  
  d.   oxygen  
  5.How many layers does Earth's atmosphere have?  
  a.   five  
  b.   seven  
  c.   four  
  d.   six  
  6.What two forms of heat transfer help create a sea breeze?  
  a.   radiation and recycling  
  b.   convection and radiation  
  c.   convection and conduction  
  d.   radiation and conduction  
  7.Where can CFCs be found?  
  a.   aerosol sprays  
  b.   refrigerators  
  c.   air conditioners  
  d.   all answers are correct  
  8.What would happen if Earth had no atmosphere?  
  a.   Earth would not have days.  
  b.   The days would be cold and the nights would be hot.  
  c.   The days would be hot and the nights would be cold.  
  d.   Earth would not have nights.  
  9.What have CFCs done to Earth and its atmosphere?  
  a.   They have caused the number of cancer cases to rise.  
  b.   They have created a hole in the ozone layer.  
  c.   They have caused more ultraviolet radiation to reach Earth.  
  d.   all answers are correct  
  10.What is it called when water changes from gas to liquid?  
  a.   evaporation  
  b.   condensation  
  c.   melting  
  d.   freezing  
  11.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 increases as you go higher  
  c.   because air is too heavy  
  d.   because air pressure decreases as you go higher  
  12.What causes a shooting star?  
  a.   a meteor in the mesosphere  
  b.   a comet in the stratosphere  
  c.   a meteor in the troposphere  
  d.   a comet in the thermosphere  
  13.What is the outermost layer of the atmosphere called?  
  a.   exosphere  
  b.   thermosphere  
  c.   stratosphere  
  d.   mesosphere  
  14.What's the difference between ozone and the oxygen you breath?  
  a.   They're made of totally different atoms.  
  b.   Ozone is made of two atoms of oxygen and the oxygen you breath is made of three.  
  c.   One is in gas form and the other is in liquid form.  
  d.   Ozone is made of three atoms of oxygen, and the oxygen you breathe is made of two.  
  15.How do CFCs destroy ozone?  
  a.   A CFC combines with a three-atom oxygen molecule.  
  b.   A carbon atom from a CFC combines with one oxygen from ozone and leaves a two-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.  
  16.Which layer of the atmosphere is named after its high temperature?  
  a.   thermosphere  
  b.   mesosphere  
  c.   stratosphere  
  d.   troposphere  
  17.Within which layer of the atmosphere do you find rain, snow, and clouds?  
  a.   thermosphere  
  b.   stratosphere  
  c.   troposphere  
  d.   mesosphere  
  18.Which layer of the atmosphere contains the ozone layer?  
  a.   troposphere  
  b.   thermosphere  
  c.   exosphere  
  d.   stratosphere  
  19.Force exerted on an area is called __________.  
  a.   pressure  
  b.   mass  
  c.   temperature  
  d.   gravity  
  20.The hydrosphere, which consists of all of Earth's water, is maintained __________.  
  a.   by recycling water in the atmosphere  
  b.   by the clouds in the atmosphere  
  c.   by removing water from the atmosphere  
  d.   by addition of water to the atmosphere  

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