Among the options, the Rockies are the youngest mountain range. They are part of the “Young Fold Mountains” formed during the late Cretaceous to Tertiary periods. In contrast, the Urals and Appalachians are ancient ranges (Paleozoic era) that have been heavily eroded over hundreds of millions of years, while the Satpura is a block mountain system of older origin. ANSWER: (A) Rockies
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The Rockies of North America are classified as Young Fold Mountains, having formed significantly later than the other listed ranges. The Appalachian and Ural mountains are “Old Fold Mountains,” dating back over 250 million years to the Paleozoic Era; they now appear as low, rounded hills due to prolonged erosion. The Satpura range in India is a structural block mountain. The Rockies, however, retain high, sharp peaks and steep gradients characteristic of more recent tectonic uplift. Understanding the age of these ranges is vital for geographers to study landform evolution and the varying rates of continental denudation.