What is the name of the mountain range that forms the border between Bulgaria and Greece?

What is the longest mountain range in North America? What is the longest mountain range in Antarctica? What is the name of the mountain range that forms the border between Argentina and Chile? Which mountain range runs along the border between Germany and Czech Republic? 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 Scandinavian Peninsula?