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As a mountain erodes away over millions of years, the downward forces acting on it decrease because there is less mass sitting atop the crustal root or pluton. This decrease in force allows the pluton to rise (albeit very little if not nil) during non-geologic time. During geologic time frames of 100 of millions of years, the rise of the pluton can be substantial enough that it can counteract erosional elevation loss and lessen the rate of elevation lost over time. So, think of a mountain as an iceberg. There is much more mass under the water/ground than there is above. As the top melts/erodes away, mass is lost and the object can rise.

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