Answer
The evolution of a mountainous desert typically involves three stages: youth, maturity, and old age. In the youth stage, the landscape features rugged mountains with steep slopes and narrow canyons. As the desert enters the maturity stage, the mountains erode, and the canyons widen, creating a more gently sloping terrain. In the old age stage, the landscape is characterized by extensive erosion, flattened mountain remnants, and broad basins.
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