sentences:  The Cascade Range has been active for about 36 million years, largely as a result of the subduction through convergence of the Juan de Fuca tectonic plate with the North American Plate, which persists at a rate of annually.Cascade volcanism has occurred intermittently; there are volcanic rocks that are probably unrelated to subduction dating to between 55 million and 42 million years ago, with the most recent activity starting roughly 5 million years ago.In the Cascade Volcanic Arc, volcanism during the Holocene epoch spans the Garibaldi Volcanic Belt in southern British Columbia in Canada to the Lassen Peak volcanic complex in northern California.