What is the peeling layer of a rock?

The peeling layer of a rock refers to the outermost layer that can flake or detach from the main body of the rock, often due to weathering processes such as freeze-thaw cycles, thermal expansion, or chemical weathering. This phenomenon is commonly observed in rocks such as granite, where pressure release or hydration can cause the outer layers to expand and separate from the underlying material. The result is a characteristic "peeling" appearance, which can affect the rock's structure and stability over time.