Yes, the Appalachian mountains of North American are slowly being worn down by the elements. In like the Rockies and many other mountain systems the Appalachians stopped growing sometime ago and have been falling victim to the forces of weathering such as erosion. This is why they are generally more low and rounded rather than high and gagged.
With the exception of a few active volcanoes in the act of erupting, all mountains are shrinking due to erosion, which begins the instant any land rises above sea level. In some cases, the rate of uplift because of tectonic forces exceeds the rate of erosion, and therefore the mountain has a net gain in elevation. But every mountain is undergoing erosion and “shrinking”, albeit usually at tiny rates.
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