What are the different types of rocks?

The oldest continental rocks are found in cratons. A craton is a stable part of the continental lithosphere,

There are three main types of rocks:

  • Igneous rocks, which are the products of magma cooling
  • Sedimentary rocks, which are the products of erosion of all types of rocks or deposition of organic matter
  • Metamorphic rocks, which are rocks of either of the two former types transformed by very different conditions of pressure and temperature than those under which they were formed 

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