Final answer:
Misti volcano in Peru was formed by the subduction of the Nazca Plate underneath the South American Plate, leading to volcanic activity in the Andes region.
Step-by-step explanation:
Misti is a volcano in Peru, which is located on the western edge of South America in the region of the Andes Mountains. The formation of this volcano can be attributed to the geological process of subduction, where the Nazca Plate is sliding underneath the South American Plate.
This area is known for its long history of subduction-related volcanism and igneous activity, especially during the Neogene portion of geologic time between 23 and 2.5 million years ago. As the oceanic crust of the Nazca Plate is forced under the continental crust, it melts and forms magma, which can rise to the surface and create volcanic formations like Misti.