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

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