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Practice Test
  1.What is the most abundant gas in Earth's atmosphere?  
  a.   oxygen  
  b.   nitrogen  
  c.   carbon  
  d.   hydrogen  
  2.What is it called when water changes from gas to liquid?  
  a.   condensation  
  b.   evaporation  
  c.   freezing  
  d.   melting  
  3.How is the troposphere warmed?  
  a.   The troposphere absorbs sunlight directly.  
  b.   The Sun warms Earth's surface, which warms the air above it.  
  c.   The gases in the troposphere absorb heat from the Sun.  
  d.   The stratosphere warms it.  
  4.How have humans altered the composition of Earth's atmosphere?  
  a.   They have made the atmospheric temperature drop.  
  b.   They have made the atmospheric pressure drop.  
  c.   They have polluted it with carbon dioxide gas.  
  d.   They have polluted it with excess ozone.  
  5.Conduction is the transfer of heat through __________.  
  a.   empty space  
  b.   radiation  
  c.   touch  
  d.   thoughts  
  6.How does the atmosphere benefit Earth?  
  a.   It creates water.  
  b.   It protects Earth from the Sun's harmful rays.  
  c.   It protects Earth from cold air.  
  d.   It protects Earth from other planets.  
  7.Force exerted on an area is called __________.  
  a.   pressure  
  b.   mass  
  c.   temperature  
  d.   gravity  
  8.What have CFCs done to Earth and its atmosphere?  
  a.   They have caused more ultraviolet radiation to reach Earth.  
  b.   They have caused the number of cancer cases to rise.  
  c.   They have created a hole in the ozone layer.  
  d.   all answers are correct  
  9.What form of energy transfer heats Earth?  
  a.   recycling  
  b.   conduction  
  c.   convention  
  d.   radiation  
  10.Heat flows from __________.  
  a.   same temperature to same temperature  
  b.   high to low temperature  
  c.   medium to high temperature  
  d.   low to high temperature  
  11.Where can CFCs be found?  
  a.   all answers are correct  
  b.   aerosol sprays  
  c.   refrigerators  
  d.   air conditioners  
  12.How many layers does Earth's atmosphere have?  
  a.   five  
  b.   seven  
  c.   six  
  d.   four  
  13.What causes a shooting star?  
  a.   a meteor in the troposphere  
  b.   a meteor in the mesosphere  
  c.   a comet in the thermosphere  
  d.   a comet in the stratosphere  
  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 is the same throughout all layers of the atmosphere  
  c.   because air pressure decreases as you go higher  
  d.   because air is too heavy  
  15.Within which layer of the atmosphere do you find rain, snow, and clouds?  
  a.   troposphere  
  b.   mesosphere  
  c.   thermosphere  
  d.   stratosphere  
  16.Which layer of the atmosphere is named after its high temperature?  
  a.   troposphere  
  b.   stratosphere  
  c.   mesosphere  
  d.   thermosphere  
  17.Why are the thermosphere and exosphere the warmest of the atmospheric layers?  
  a.   because the air pressure is too great  
  b.   because they are closest to the Sun  
  c.   because of the gases trapped in these layers  
  d.   because the underlying mesosphere keeps the warm air there  
  18.Which layer of the atmosphere contains the ozone layer?  
  a.   thermosphere  
  b.   exosphere  
  c.   stratosphere  
  d.   troposphere  
  19.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  
  20.What preceded the growth and survival of green plants on Earth?  
  a.   the formation of the solar system  
  b.   human life  
  c.   the formation of an ozone layer  
  d.   the formation of severe weather  

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