In the line of arc volcanoes,like the Cascades of Washington and Oregon,over an active subduction zone,a series of events leads to the magmas that erupt at the surface.What magma forms first,and where and how does it form?

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The Answer of In the line of arc volcanoes,like the Cascades of Washington and Oregon,over an active subduction zone,a series of events leads to the magmas that erupt at the surface.What magma forms first,and where and how does it form?

In the Line of Arc Volcanoes,like the Cascades of Washington