A part of the rock forming material of the earth comprises:
Correct answer: C. Aluminosilicates of Na, K and Ca
- A. Oxides of Ca and Na
- B. Oxides of Ca and K
- C. Aluminosilicates of Na, K and Ca
- D. Nitrates of Fe and Al
Explanation
Common rock-forming silicate minerals are aluminosilicates containing sodium, potassium and calcium, such as feldspars. Nitrates and simple metallic oxides are not the principal constituents referred to here.
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