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Practice Test
  1.Within which layer of the atmosphere do you find rain, snow, and clouds?  
  a.   mesosphere  
  b.   thermosphere  
  c.   stratosphere  
  d.   troposphere  
  2.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  
  3.How have humans altered the composition of Earth's atmosphere?  
  a.   They have made the atmospheric pressure drop.  
  b.   They have made the atmospheric temperature drop.  
  c.   They have polluted it with carbon dioxide gas.  
  d.   They have polluted it with excess ozone.  
  4.How does the atmosphere benefit Earth?  
  a.   It protects Earth from other planets.  
  b.   It creates water.  
  c.   It protects Earth from cold air.  
  d.   It protects Earth from the Sun's harmful rays.  
  5.What is the outermost layer of the atmosphere called?  
  a.   exosphere  
  b.   thermosphere  
  c.   stratosphere  
  d.   mesosphere  
  6.What two forms of heat transfer help create a sea breeze?  
  a.   radiation and conduction  
  b.   convection and conduction  
  c.   radiation and recycling  
  d.   convection and radiation  
  7.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 addition of water to the atmosphere  
  d.   by removing water from the atmosphere  
  8.Which layer of the atmosphere contains the ozone layer?  
  a.   stratosphere  
  b.   troposphere  
  c.   exosphere  
  d.   thermosphere  
  9.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.  
  10.Where can CFCs be found?  
  a.   aerosol sprays  
  b.   air conditioners  
  c.   refrigerators  
  d.   all answers are correct  
  11.What's the difference between ozone and the oxygen you breath?  
  a.   They're made of totally different atoms.  
  b.   One is in gas form and the other is in liquid form.  
  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.  
  12.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  
  13.What is the most abundant gas in Earth's atmosphere?  
  a.   hydrogen  
  b.   nitrogen  
  c.   oxygen  
  d.   carbon  
  14.How many layers does Earth's atmosphere have?  
  a.   five  
  b.   seven  
  c.   six  
  d.   four  
  15.Heat flows from __________.  
  a.   low to high temperature  
  b.   high to low temperature  
  c.   same temperature to same temperature  
  d.   medium to high temperature  
  16.What form of energy transfer heats Earth?  
  a.   conduction  
  b.   radiation  
  c.   recycling  
  d.   convention  
  17.What preceded the growth and survival of green plants on Earth?  
  a.   the formation of severe weather  
  b.   the formation of an ozone layer  
  c.   the formation of the solar system  
  d.   human life  
  18.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 is too heavy  
  d.   because air pressure decreases as you go higher  
  19.Which layer of the atmosphere is named after its high temperature?  
  a.   stratosphere  
  b.   troposphere  
  c.   thermosphere  
  d.   mesosphere  
  20.What is it called when water changes from gas to liquid?  
  a.   freezing  
  b.   evaporation  
  c.   melting  
  d.   condensation  

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