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

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