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Que.  The amount of argon in the atmosphere 
a.  0.03% 
b.  78% 
c.  0.90% 
d.  0.30% 
Correct Answer:0.90%

Que.  The amount of argon in the atmosphere 
a.  0.03% 
b.  78% 
c.  0.90% 
d.  0.30% 
Correct Answer:0.90%
