Which Appalachian mountain range is known for having some of the oldest exposed rock formations in North America?
  • Adirondacks
What type of coal, mined in Appalachia, is known for its high carbon content and is often used in steel production?
  • Anthracite
What major infrastructure project of the 20th century helped connect Appalachian communities to broader U.S. markets?
  • The Appalachian Regional Highway System