Question

what two well - known mountain ranges are part of the appalachian mountain system?
a rocky mountains and great smoky mountains
b blue ridge mountains and great smoky mountains
c rocky mountains and blue ridge mountains
d sierra mountains and great smoky mountains
question 10 (1 point)
what has caused the mountains in the appalachian mountain system to wear down over time?
a glaciers
b earthquakes
c strong winds
d erosion

Explanation:

For the first question: The Rocky Mountains and Sierra Mountains are separate mountain systems in North America, not part of the Appalachians. The Blue Ridge and Great Smoky Mountains are major sub-ranges of the Appalachian system.
For the second question: Long-term natural processes like water, wind, and chemical breakdown (collectively called erosion) have gradually worn down the ancient Appalachian Mountains. Glaciers, earthquakes, and strong winds are not the primary long-term cause of their low, rounded shape.

Answer:

1. b. Blue Ridge Mountains and Great Smoky Mountains
2. d. erosion