24 Volcanic activity occurring at subduction boundaries usually results in more violent eruptions. Figure #1 Mount St. Helen’sFigure #2 Mt. Uluigalau Volcano, FijiFigure #1 shows that volcanoes form [on land, in the ocean] when an ocean plate [subducts, overrides].Figure #2 shows the formation of a [mid-ocean ridge, deep ocean trench] and island arc. The island arc is formed from [volcanoes, earthquakes, both of these].
32 Many earthquakes and volcanic eruptions surround the Pacific Ocean Many earthquakes and volcanic eruptions surround the Pacific Ocean. This is known as the “Ring of Fire”.The locations of earthquakes and volcanoes surround the entire [Atlantic, Pacific] ocean. This is known as the “Ring of Fire”.Locations of earthquakes and volcanoes [are, are not] consistent with tectonic plate boundaries.