How does the erosion of the appalachin mountains support the principle of uniformitarianism?

The erosion of the Appalachian Mountains over millions of years supports the principle of uniformitarianism, which states that the same processes we observe today have been at work throughout Earth's history. By studying the gradual erosion of these ancient mountains, geologists can infer the long-term effects of processes like weathering and uplift, supporting the idea that past geological events can be understood through present-day processes.