It is the highest dormant volcano on Earth, located in the middle section of the Andes Mountains bordering Argentina in northern Chile, with an altitude of approximately 6739 meters. This stratovolcano is composed of dense lava flows, volcanic ash, and rock fragments, forming a significant volcanic cone. There have been three eruptions in history, with the last one occurring in 1877. The prominent feature is the presence of thick lava flows on its volcanic cone, which, when flowing on steep surfaces, cool at the top and form parallel ridges at a 90 ° angle to the flow direction, resembling accordion folds in appearance. In 1999, three mummies of Inca children were discovered near the mountaintop