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ch20 - MULTIPLECHOICE. 1 Thetwo most abundant elementsin...

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  MULTIPLE CHOICE.  Choose the one alternative that best completes the statement or answers the question.  1) 
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The two  most  abundant  elements in  Earth's crust  are 
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1)  _______  A) 
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silicon and oxygen. 
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B)  quartz  and feldspar. 
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oxygen and aluminum. 
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D)  silicates  and  carbonates.    2
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Based on its  abundance  in Earth's  crust, most  rocks  contain a  mineral  composed of  the elements  oxygen and 
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2)  _______  A) 
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iron. 
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B) 
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silicon. 
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C) 
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carbon. 
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D)  su l  
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The three  sources that  brought  young Earth  to its melting  point were 
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3)  _______  A)  i m p a c t   h e a t i n g ,   g r a v itat ion al  co ntr act ion  hea tin g,  rad ioa cti ve  dec ay  hea tin g.  i m p a ct  h e ating,  convectio heating,  radiomet ric  heating. 
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impact heating,  convection heating, radioactive decay heating.  D) 
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collisional heating,  contraction heating, radiometric heating.    4) 
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Young Earth  developed a  layered  structure  under the  influence of 
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