Three most occurring elements into the earth crust are : (a) \( \mathrm{O}, \mathrm{Si}, \mathrm...

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Three most occurring elements into the earth crust are :
(a) \( \mathrm{O}, \mathrm{Si}, \mathrm{Al} \)
(b) \( \mathrm{Si}, \mathrm{O}, \mathrm{Fe} \)
(c) \( \mathrm{Fe}, \mathrm{Ca}, \mathrm{Al} \)
(d) Si, O, N
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