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    | • | Example
    questions: 
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    | • | True/False: 
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    |  | – | Jupiter
    was probably influential in preventing the 
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    |  | 
   
    |  | formation
    of a planet at the location of the asteroid belt. 
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    |  | 
   
    |  | – | The
    dirty snowball theory suggests that the head of a 
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    |  | 
   
    |  | comet
    is composed of ices. 
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    |  | 
   
    |  | – | Jupiter
    radiates more heat than it absorbs from the sun. 
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    |  | 
   
    |  | – | Venus is very hot because its atmosphere is rich in CO2. 
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    |  | 
   
    |  | – | The
    Greenhouse effect occurs because gases like carbon 
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    |  | 
   
    |  | monoxide
    are opaque to IR radiation. 
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    |  | 
   
    |  | – | The
    Jovian planets have lower densities than the 
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    |  | 
   
    |  | terrestrial
    planets. 
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