Quiz: Identify the main geological difference between the Appalach February 16, 2025 by Bennett Ridge Identify the main geological difference between the Appalachian Mountains and the Rocky Mountains. Discover more about Appalachian Tours at our home page. A) The Appalachians are older and more eroded, while the Rockies are younger and more rugged. B) The Appalachians are primarily volcanic, while the Rockies are sedimentary. C) The Appalachians have a higher elevation than the Rockies. D) The Appalachians are formed from limestone, while the Rockies are formed from granite. Submit Answer