Geology of the Pacific Northwest, Pacific Northwest, Cascade Volcanoes, 1980 eruption of Mount St. Helens, Lassen Peak, Mount Meager, Mount Mazama, Volcanism in Canada, Hawaiian eruption, Phreatic eruption, Phreatomagmatic eruption, Subglacial eruption, Peléan eruption, Plinian eruption, Volcanism in Eastern Canada, Columbia River Basalt Group, Missoula Floods, North Cascades, Geography of the North Cascades, Coast Mountains, Insular Mountains