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Which of the following are the two main constituents of granite?

  • A.Iron and silica
  • B.Iron and silver
  • C.Silica and aluminium
  • D.Iron oxide and potassium

Answer: C

Granite is composed mainly of silica and alumina - that is, of quartz and feldspar, with mica in smaller amounts.

It is a coarse-grained igneous rock, crystallised slowly at depth, and its silica-rich composition is why it is classed as an acid igneous rock.

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