The vast majority, if not all, of Canada’s volcanoes are found in the Cascade Range, which is a range of mountains that goes from California up into British Columbia. There are volcanoes here because the Cascade Range is the result of one plate of the earth’s crust (the Juan de Fuca plate to the west) moving away from the Pacific plate and towards/into/below the North American plate. This slow movement, called subduction, pushes rock and materials of the crust upwards to form the mountains, and also forms volcanoes. The first link below has a more in-depth discussion of how subduction works.
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