Where are most of the volcanoes in South America?

Question

Where was the Chacaltaya glacier, one of the highest in South America, which was 0.22 km2 (0.085 sq mi) in 1940 and effectively gone in 2009?

Answer 1

Along the west (Pacific) coast
Most of the volcanoes in South America are in or near the Andes which runs north to south along the length of the continent, part of the Pacific Ring of Fire.