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Practice Test
  1.How does the atmosphere benefit Earth?  
  a.   It protects Earth from cold air.  
  b.   It creates water.  
  c.   It protects Earth from the Sun's harmful rays.  
  d.   It protects Earth from other planets.  
  2.Conduction is the transfer of heat through __________.  
  a.   thoughts  
  b.   radiation  
  c.   touch  
  d.   empty space  
  3.What would happen if Earth had no atmosphere?  
  a.   The days would be cold and the nights would be hot.  
  b.   The days would be hot and the nights would be cold.  
  c.   Earth would not have days.  
  d.   Earth would not have nights.  
  4.Heat flows from __________.  
  a.   high to low temperature  
  b.   same temperature to same temperature  
  c.   low to high temperature  
  d.   medium to high temperature  
  5.Force exerted on an area is called __________.  
  a.   gravity  
  b.   mass  
  c.   temperature  
  d.   pressure  
  6.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  
  7.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.  
  8.How many layers does Earth's atmosphere have?  
  a.   four  
  b.   seven  
  c.   six  
  d.   five  
  9.The hydrosphere, which consists of all of Earth's water, is maintained __________.  
  a.   by the clouds in the atmosphere  
  b.   by recycling water in the atmosphere  
  c.   by removing water from the atmosphere  
  d.   by addition of water to the atmosphere  
  10.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 severe weather  
  d.   the formation of an ozone layer  
  11.Within which layer of the atmosphere do you find rain, snow, and clouds?  
  a.   mesosphere  
  b.   troposphere  
  c.   thermosphere  
  d.   stratosphere  
  12.Why are the thermosphere and exosphere the warmest of the atmospheric layers?  
  a.   because they are closest to the Sun  
  b.   because the air pressure is too great  
  c.   because of the gases trapped in these layers  
  d.   because the underlying mesosphere keeps the warm air there  
  13.What is the most abundant gas in Earth's atmosphere?  
  a.   nitrogen  
  b.   hydrogen  
  c.   carbon  
  d.   oxygen  
  14.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 made the atmospheric pressure drop.  
  d.   They have polluted it with carbon dioxide gas.  
  15.What is the outermost layer of the atmosphere called?  
  a.   exosphere  
  b.   mesosphere  
  c.   thermosphere  
  d.   stratosphere  
  16.Which layer of the atmosphere contains the ozone layer?  
  a.   troposphere  
  b.   stratosphere  
  c.   exosphere  
  d.   thermosphere  
  17.Which layer of the atmosphere is named after its high temperature?  
  a.   thermosphere  
  b.   mesosphere  
  c.   troposphere  
  d.   stratosphere  
  18.What two forms of heat transfer help create a sea breeze?  
  a.   radiation and recycling  
  b.   radiation and conduction  
  c.   convection and radiation  
  d.   convection and conduction  
  19.What have CFCs done to Earth and its atmosphere?  
  a.   They have caused the number of cancer cases to rise.  
  b.   They have caused more ultraviolet radiation to reach Earth.  
  c.   all answers are correct  
  d.   They have created a hole in the ozone layer.  
  20.What causes a shooting star?  
  a.   a meteor in the mesosphere  
  b.   a comet in the thermosphere  
  c.   a comet in the stratosphere  
  d.   a meteor in the troposphere  

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