The diagram demonstrates the sequence of stages involved in the formation of volcanoes.
Overall, the formation begins with the magma accumulation in the mantle and culminates with the land depression. It is noteworthy that an eruption causes the most significant change in the formation.
Initially, underground magma begins to accumulate gradually, which creates a negligible magma chamber in the crust. Subsequently, after a period of time, the overloading chamber causes massive pressure to the surface; therefore, the surface is torn violently, and the interstice is simultaneously discernible.
In the next stage of the formation, a supervolcano is created since the magma in the crust is overfulfiled and then ruptured, which leads to a catastrophic eruption including smoke and lava coming from the magma chamber. Finally, after releasing most of the magma in the mantle, the chamber circumscribes its size. At the same time, the crust beneath the surface subsides, which leads to the emergence of land depression on the surface.