Original sentence: Alerce Glacier is one of seven glaciers on Mount Tronador, on its Argentinian side.The glacier's unusual dark brown colour comes from dirt and sediment picked up in the glacier's accumulation zone, which itself is fed from Río Manso glacier, several hundred metres higher up the mountain.Ventisquero Negro ("black snowdrift" in Spanish) is a rather unique glacier at the base of Mount Tronador in Nahuel Huapi National Park, on the western border of Argentina
Edited sentence: Alerce Glacier is one of seven glaciers on Tronador, on its Argentinian side.The glacier's unusual dark brown colour comes from dirt and sediment picked up in the glacier's accumulation zone, which itself is fed from Río Manso Glacier, several hundred metres higher up the mountain.Ventisquero Negro ("black snowdrift" in Spanish) is a rather unique glacier at the base of Tronador in Nahuel Huapi National Park, on the western border of Argentina