What type of rocks are formed from existing igneous or sedimentary rocks that undergo metamorphosis?

Rocks that develop from the transformation of existing igneous or sedimentary rocks through various processes such as heat, pressure, and chemical reactions are classified as metamorphic rocks. The metamorphosis can alter the mineral composition and structure of the original rock, leading to the formation of new textures and minerals not present in the original rock. This process often occurs deep within the Earth where conditions are ideal for such transformations.

In contrast, clastic rocks are formed from the accumulation and cementation of rock fragments and do not result from the metamorphosis of other rocks. Igneous rocks form from the cooling and solidification of molten material, while sedimentary rocks develop from the accumulation of sediments. Metamorphic processes are specifically responsible for converting pre-existing rocks into a new type, thereby defining the category of metamorphic rocks.