Which mountain range runs through the Scandinavian Peninsula?

What is the name of the mountain range that forms the border between Bulgaria and Greece? Which mountain range is home to the highest peak in the contiguous United States? What is the name of the mountain range that runs along the border between Italy and Slovenia? Which mountain range forms the border between Poland and the Czech Republic? Which mountain range runs through the state of Montana in the United States? Which mountain range runs through the country of Romania? Which mountain range runs through the country of Morocco? What is the world's longest continental mountain range?