A 4.6 billion years
B 5.5 billion years
C 6.5 billion years
D 7.5 billion years
E None of These
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The raw material used for the manufacture of the Glass and is cement is :
A Clay B Gypsum C Washing soda D Limestone
A 4.6 billion years
B 5.5 billion years
C 6.5 billion years
D 7.5 billion years
E None of These
A Clay B Gypsum C Washing soda D Limestone