The Cascade Volcanic Arc is a mountain range in the Pacific Northwest of the United States, formed by a series of active and dormant volcanoes. It stretches from northern California through Oregon and Washington to southern British Columbia. This volcanic arc is part of the larger Ring of Fire, a region known for its seismic activity and volcanic eruptions. The arc is primarily created by the subduction of the Juan de Fuca Plate beneath the North American Plate. Notable volcanoes in the Cascade range include Mount St. Helens, Mount Rainier, and Mount Hood. These volcanoes are monitored closely due to their potential for eruptions and the impact they can have on surrounding communities.