Respuesta :

Answer:

On their mode of formation

Explanation:

The mode of formation of rocks is the basis of classifying them into the three main categories.

These categories are;

  • Igneous rocks: they are formed by the cooling and solidification of molten magma.
  • Sedimentary rocks: they are formed by the compaction and lithification of sediments.
  • Metamorphic rocks are changed rocks formed when rocks are subjected to temperature conditions that alters their mineral composition.