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Practice Test
  1.What is the outermost layer of the atmosphere called?  
  a.   exosphere  
  b.   thermosphere  
  c.   mesosphere  
  d.   stratosphere  
  2.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 other planets.  
  d.   It protects Earth from cold air.  
  3.How many layers does Earth's atmosphere have?  
  a.   seven  
  b.   six  
  c.   five  
  d.   four  
  4.Where can CFCs be found?  
  a.   air conditioners  
  b.   refrigerators  
  c.   all answers are correct  
  d.   aerosol sprays  
  5.What causes a shooting star?  
  a.   a comet in the thermosphere  
  b.   a meteor in the mesosphere  
  c.   a meteor in the troposphere  
  d.   a comet in the stratosphere  
  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 decreases as you go higher  
  c.   because air is too heavy  
  d.   because air pressure is the same throughout all layers of the atmosphere  
  7.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  
  8.Heat flows from __________.  
  a.   same temperature to same temperature  
  b.   high to low temperature  
  c.   medium to high temperature  
  d.   low to high temperature  
  9.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.  
  10.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  
  11.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 nights.  
  d.   Earth would not have days.  
  12.What is the most abundant gas in Earth's atmosphere?  
  a.   oxygen  
  b.   hydrogen  
  c.   carbon  
  d.   nitrogen  
  13.How do CFCs destroy ozone?  
  a.   A chlorine atom from a CFC combines with two oxygen atoms from ozone and leaves an oxygen atom.  
  b.   A CFC combines with a three-atom oxygen molecule.  
  c.   A chlorine atom from a CFC combines with one oxygen from ozone and leaves a two- atom oxygen molecule.  
  d.   A carbon atom from a CFC combines with one oxygen from ozone and leaves a two-atom oxygen molecule.  
  14.Which layer of the atmosphere is named after its high temperature?  
  a.   troposphere  
  b.   thermosphere  
  c.   stratosphere  
  d.   mesosphere  
  15.Within which layer of the atmosphere do you find rain, snow, and clouds?  
  a.   mesosphere  
  b.   troposphere  
  c.   thermosphere  
  d.   stratosphere  
  16.What is it called when water changes from gas to liquid?  
  a.   freezing  
  b.   evaporation  
  c.   melting  
  d.   condensation  
  17.What have CFCs done to Earth and its atmosphere?  
  a.   They have created a hole in the ozone layer.  
  b.   They have caused more ultraviolet radiation to reach Earth.  
  c.   all answers are correct  
  d.   They have caused the number of cancer cases to rise.  
  18.What preceded the growth and survival of green plants on Earth?  
  a.   the formation of an ozone layer  
  b.   the formation of severe weather  
  c.   the formation of the solar system  
  d.   human life  
  19.How is the troposphere warmed?  
  a.   The gases in the troposphere absorb heat from the Sun.  
  b.   The troposphere absorbs sunlight directly.  
  c.   The stratosphere warms it.  
  d.   The Sun warms Earth's surface, which warms the air above it.  
  20.What form of energy transfer heats Earth?  
  a.   radiation  
  b.   convention  
  c.   conduction  
  d.   recycling  

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