Here's why:
* Subduction Zones: The Juan de Fuca Plate is an oceanic plate that is denser than the North American Plate. This density difference causes the Juan de Fuca Plate to slide (subduct) beneath the North American Plate.
* Magma Generation: The subduction process causes the mantle rock above the Juan de Fuca Plate to melt, forming magma. This magma is less dense than the surrounding rock and rises towards the surface.
* Volcanoes: As the magma reaches the surface, it erupts, forming volcanoes. The Cascade Range is a string of these volcanoes that have formed along the subduction zone.
So, while it's not technically a "small plate," the Juan de Fuca Plate is the driving force behind the Cascade Range's formation.
