How many rock types are there?

There are many different kinds of rocks that are grouped under three families on the basis of their mode of formation. They are: 

  • Igneous Rocks: solidified from magma and lava; 
  • Sedimentary Rocks: the result of deposition of fragments of rocks by exogenous processes; 
  • Metamorphic Rocks: formed out of existing rocks undergoing recrystallisation.

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