Answer theese please in one word or a sentence

which is the first metal to be widely used ?
which 2 minerals formed the basis of the machine age ?
which mineral forms the basis of modern chemical industry ?
name 2 atomic minerals of which india has one of the largest reserves in the world ?
name a major gas pipeline in the western region of india

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Answers

2015-11-30T16:42:21+05:30