How are all the Cascade Volcanoes formed where are they located?
The Cascade range is part of a vast mountain chain that extends from British Columbia to Northern California. The Northern Cascade consist of jagged mountains and contains numerous glaciers. They are mostly composed of Mesozoic crystalline and metamorphic rocks. The Cascades were formed over time by the Cascadia subduction zone. The subduction process leaves behind and pushes up rock. The subduction also causes super heated water to melt rock into magma below the surface of the earth. This magma collects in chambers below the mountains. Eventually the pressur builds up and needs to be released. The magma slowly pushes its way to the surface. When the pressure is great enough, the magma erupts out of the earth. This is how the Cascade volcanoes were formed.