Identify the main geological difference between the Appalachian Mountains and the Rocky Mountains.

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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.

Quiz: Identify the main geological difference between the Appalach