A part of the rock forming material of the earth comprises:

Correct answer: D. Aluminosilicates of Na, K and Ca

  • A. Oxides of Ca and Na
  • B. Oxides of Ca and K
  • C. Nitrates of Fe and Al
  • D. Aluminosilicates of Na, K and Ca

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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