Which of the following best explains why the older fold mountains are much lower and less rugged than the newer ones?

Answer Details

The answer is D - The older fold mountains have been subjected to the forces of denudation for longer geological periods. Denudation refers to the wearing away of the Earth's surface by processes such as erosion and weathering. The older fold mountains have existed for much longer periods and have been exposed to these processes for a longer time, which has resulted in them being lower and less rugged than the newer ones. In contrast, the newer fold mountains are still being formed and have not yet had as much time to undergo denudation.