Rocky mountains - A natural barrier to settling in the west
Mount McKinley - The highest mountain peak in North America
Niagara Falls - A major source of hydroelectric power
Paricutin - A volcano that grew out of a cornfield in 1943
Hope this helps!
Answer:
Mount Mckinley is the highest mountain peak, paricutin is a volcano that grew, Niagara falls is a hydroelectric, and Rocky Mountains is a natural barrier
