How could a rock be changed but still classified as the same form of rock?

A rock can undergo changes through processes like weathering, erosion, or metamorphism while still being classified as the same type. For example, a granite rock can be weathered into sediment but, if the sediment is later compacted and cemented into a new rock, it can still be identified as sedimentary rock derived from granite. Similarly, a metamorphic rock like schist can change in mineral composition through heat and pressure but remains classified as schist. The key lies in the rock's mineral composition and the processes it undergoes, which help maintain its classification.