Answer:
Metamorphic rocks
Step-by-step explanation:
Metamorphic rocks are formed from the transformation of other existing rocks. This original rock is called a protolith, which is the name given in geology to the rock from which, by various geological processes (including metamorphism), a new rock was formed.
The protoliths can be igneous rocks, sedimentary and even metamorphic rocks. Due to changes in temperature and pressure resulting from the movements of the earth's crust over geological time, the rocks may change, both in their chemical composition and in their visual appearance and texture, while still maintaining their solid form.