How was the Andes Mountains and Cascade most likely formed?

The Andes Mountains were formed as a result of the subduction of the Nazca Plate beneath the South American Plate. As the Nazca Plate moves eastward, it is forced beneath the South American Plate, causing it to melt. This molten rock rises to the surface and forms volcanoes, which eventually build up into mountain ranges. The Andes Mountains are still growing today, as the Nazca Plate continues to subduct beneath the South American Plate.

Cascade Range

The Cascade Range was formed as a result of the subduction of the Juan de Fuca Plate beneath the North American Plate. As the Juan de Fuca Plate moves eastward, it is forced beneath the North American Plate, causing it to melt. This molten rock rises to the surface and forms volcanoes, which eventually build up into mountain ranges. The Cascade Range is still growing today, as the Juan de Fuca Plate continues to subduct beneath the North American Plate.