McqMate
| Q. |
Major portion of the earth's crust is mainly constituted by – |
| A. | Oxygen and Iron |
| B. | Oxygen and Silicon |
| C. | Silicon and Iron |
| D. | Silicon and Aluminium |
| Answer» B. Oxygen and Silicon | |
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Explanation: Oxygen is the most abundant element in the earth's crust, comprising 46.6% or the crust by weight. Silicon 28%, aluminum 8.2%, iron 5.6%, calcium 4.2%, sodium 2.5%, magnesium 2.4%, potassium, 2.0%, and titanium 0.61% also comprise the crust. Given the abundance of oxygen and silicon, the silicates are the most abundant minerals in the earth's crust. |
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