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Practice Test
  1.Which layer of the atmosphere contains the ozone layer?  
  a.   thermosphere  
  b.   exosphere  
  c.   troposphere  
  d.   stratosphere  
  2.What is it called when water changes from gas to liquid?  
  a.   condensation  
  b.   freezing  
  c.   melting  
  d.   evaporation  
  3.Force exerted on an area is called __________.  
  a.   mass  
  b.   gravity  
  c.   pressure  
  d.   temperature  
  4.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  
  5.How does the atmosphere benefit Earth?  
  a.   It creates water.  
  b.   It protects Earth from other planets.  
  c.   It protects Earth from cold air.  
  d.   It protects Earth from the Sun's harmful rays.  
  6.What causes a shooting star?  
  a.   a meteor in the troposphere  
  b.   a comet in the thermosphere  
  c.   a meteor in the mesosphere  
  d.   a comet in the stratosphere  
  7.What preceded the growth and survival of green plants on Earth?  
  a.   the formation of severe weather  
  b.   the formation of the solar system  
  c.   the formation of an ozone layer  
  d.   human life  
  8.Why are there fewer molecules of air up in the mountains?  
  a.   because air pressure increases as you go higher  
  b.   because air is too heavy  
  c.   because air pressure decreases as you go higher  
  d.   because air pressure is the same throughout all layers of the atmosphere  
  9.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.  
  10.How many layers does Earth's atmosphere have?  
  a.   six  
  b.   seven  
  c.   five  
  d.   four  
  11.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.   Ozone is made of two atoms of oxygen and the oxygen you breath is made of three.  
  c.   They're made of totally different atoms.  
  d.   Ozone is made of three atoms of oxygen, and the oxygen you breathe is made of two.  
  12.What would happen if Earth had no atmosphere?  
  a.   Earth would not have nights.  
  b.   The days would be cold and the nights would be hot.  
  c.   Earth would not have days.  
  d.   The days would be hot and the nights would be cold.  
  13.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  
  14.What is the most abundant gas in Earth's atmosphere?  
  a.   hydrogen  
  b.   carbon  
  c.   oxygen  
  d.   nitrogen  
  15.Heat flows from __________.  
  a.   low to high temperature  
  b.   medium to high temperature  
  c.   same temperature to same temperature  
  d.   high to low temperature  
  16.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.   all answers are correct  
  d.   They have created a hole in the ozone layer.  
  17.What two forms of heat transfer help create a sea breeze?  
  a.   convection and radiation  
  b.   convection and conduction  
  c.   radiation and recycling  
  d.   radiation and conduction  
  18.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 excess ozone.  
  d.   They have polluted it with carbon dioxide gas.  
  19.Which layer of the atmosphere is named after its high temperature?  
  a.   troposphere  
  b.   thermosphere  
  c.   stratosphere  
  d.   mesosphere  
  20.Where can CFCs be found?  
  a.   all answers are correct  
  b.   air conditioners  
  c.   aerosol sprays  
  d.   refrigerators  

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