Q: 50 (IAS/2009)

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In the structure of planet Earth, below the mantle, the core is mainly made up of which one of the following ?
question_subject: 
Geography
question_year: 
2009
question_exam: 
IAS
question_sub_subject: 
Physical Geography
question_topic: 
Earth
stats: 
0,4472,1240,320,184,4472,736