Mount Cayley

Mount Cayley began erupting about 4 million years ago and has grown steadily since then. Like all of the volcanoes further south, Mount Cayley has its origins in the Cascadia subduction zone—a long convergent plate boundary that stretches from mid-Vancouver Island to Northern California.[7] The subduction zone separates the Juan de Fuca, Explorer, Gorda and North American Plates. Here, the oceanic crust of the Pacific Ocean sinks beneath North America at a rate of 40 millimetres (1.6 in) per year.[8] Hot magma upwelling above the descending oceanic plate creates volcanoes, and each individual volcano erupts for a few million years. These volcanoes are commonly referred to as Cascade volcanoes because they were formed by Cascadia subduction

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