The picture represents how does supervolcanoes erupt in stages. The process starts when the pressure pushes magna until it’s eruption and ends with some changes on surface.
To begin with, several fissures are emerged and goes down through crust. By the time, magma pushes itself through mantle reaching crust. After times, magma which was pushed begins accumulating and increasing itself into crust until latitude of the fissures reaches this cumulation. Once the cumulation have been crossed paths, a pressure under mantle starts pushing magma through holes. When the pressure have pushed it enough hard, eruptions is started. In the process of it, a lot of smoke and lava go out through the holes. The process is being continued until the time when the pressure under crust reduces. After supervolcanoes’ eruption, unevenness are formed, which means there was eruption.
To close with, according the diagram, magma pushed by pressure underground goes though holes and erupt with lava and smoke. Nevertheless, at the end of the process, instead of the holes there appear unevenness.