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Practice Test
  1.What form of energy transfer heats Earth?  
  a.   conduction  
  b.   convention  
  c.   radiation  
  d.   recycling  
  2.What preceded the growth and survival of green plants on Earth?  
  a.   the formation of the solar system  
  b.   the formation of severe weather  
  c.   the formation of an ozone layer  
  d.   human life  
  3.Heat flows from __________.  
  a.   high to low temperature  
  b.   low to high temperature  
  c.   medium to high temperature  
  d.   same temperature to same temperature  
  4.How is the troposphere warmed?  
  a.   The stratosphere warms it.  
  b.   The troposphere absorbs sunlight directly.  
  c.   The gases in the troposphere absorb heat from the Sun.  
  d.   The Sun warms Earth's surface, which warms the air above it.  
  5.The hydrosphere, which consists of all of Earth's water, is maintained __________.  
  a.   by addition of water to the atmosphere  
  b.   by removing water from the atmosphere  
  c.   by the clouds in the atmosphere  
  d.   by recycling water in the atmosphere  
  6.What is the most abundant gas in Earth's atmosphere?  
  a.   oxygen  
  b.   hydrogen  
  c.   carbon  
  d.   nitrogen  
  7.What would happen if Earth had no atmosphere?  
  a.   Earth would not have days.  
  b.   Earth would not have nights.  
  c.   The days would be cold and the nights would be hot.  
  d.   The days would be hot and the nights would be cold.  
  8.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  
  9.Which layer of the atmosphere contains the ozone layer?  
  a.   exosphere  
  b.   stratosphere  
  c.   troposphere  
  d.   thermosphere  
  10.How does the atmosphere benefit Earth?  
  a.   It protects Earth from other planets.  
  b.   It creates water.  
  c.   It protects Earth from the Sun's harmful rays.  
  d.   It protects Earth from cold air.  
  11.What have CFCs done to Earth and its atmosphere?  
  a.   all answers are correct  
  b.   They have created a hole in the ozone layer.  
  c.   They have caused more ultraviolet radiation to reach Earth.  
  d.   They have caused the number of cancer cases to rise.  
  12.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 three atoms of oxygen, and the oxygen you breathe is made of two.  
  c.   They're made of totally different atoms.  
  d.   Ozone is made of two atoms of oxygen and the oxygen you breath is made of three.  
  13.Why are there fewer molecules of air up in the mountains?  
  a.   because air is too heavy  
  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 pressure increases as you go higher  
  14.Where can CFCs be found?  
  a.   all answers are correct  
  b.   aerosol sprays  
  c.   air conditioners  
  d.   refrigerators  
  15.Why are the thermosphere and exosphere the warmest of the atmospheric layers?  
  a.   because the air pressure is too great  
  b.   because the underlying mesosphere keeps the warm air there  
  c.   because they are closest to the Sun  
  d.   because of the gases trapped in these layers  
  16.What is the outermost layer of the atmosphere called?  
  a.   mesosphere  
  b.   exosphere  
  c.   stratosphere  
  d.   thermosphere  
  17.Which layer of the atmosphere is named after its high temperature?  
  a.   thermosphere  
  b.   troposphere  
  c.   stratosphere  
  d.   mesosphere  
  18.What two forms of heat transfer help create a sea breeze?  
  a.   convection and radiation  
  b.   radiation and conduction  
  c.   radiation and recycling  
  d.   convection and conduction  
  19.How many layers does Earth's atmosphere have?  
  a.   four  
  b.   six  
  c.   seven  
  d.   five  
  20.Force exerted on an area is called __________.  
  a.   gravity  
  b.   pressure  
  c.   temperature  
  d.   mass  

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