Q. Major portion of the earth's crust is mainly constituted by
A) Oxygen and Silicon
B) Oxygen and Iron
C) Silicon and Aluminium
D) Silicon and Iron
โ Correct Answer: Oxygen and Silicon
Exam Insight
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A) Oxygen and Silicon
B) Oxygen and Iron
C) Silicon and Aluminium
D) Silicon and Iron
โ Correct Answer: Oxygen and Silicon
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