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Building Materials

Q1: Pick up the plutonic rock from the following:

A Granite

B Dolerite

C Basalt

D All the above.

ANS:A - Granite

Plutonic rocks are those rocks which form due to late crystallisation of magma as magma cools inside the earth's surface. Due to this the mineral crystals found in magma get enough time for crystallisation. These rocks contain big grains of their minerals. Granite is also a plutonic rock containing quartz, mica, feldspar which are clearly visible.



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