Appalachians - Nackvak Fjord - Topography

What is a mop used for

How is a Fjord created?

What is a well-known chain of valleys in the Appalachian Region?

Rolling hills, valleys, small mountains, bluffs, and plateaus. Which of those landforms are in the Appalachians Region?

In the Appalachian Region, which mountain chain is the oldest?

The Appalachian Region used to have sharp peaks on their mountains but they have become smooth and rounded over the years, what caused this?