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GS Geography Physical Geography of World
Q.

Marble comes under which category of rocks?
Explanation:

ANS. (C) 
Marble is a metamorphic rock that forms when limestone is subjected to the heat and pressure of metamorphism.  It is composed primarily of the mineral calcite (CaCO) and usually contains 3 other minerals, such as clay minerals, micas, quartz, pyrite, iron oxides, and graphite. Under the conditions of metamorphism, the calcite in the limestone recrystallizes to form a rock that is a mass of interlocking calcite crystals.

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