There are four types of volcanoes Dome,
Dome volcanoes are caused by viscous lava piling up around the vent.
Composite volcanoes are made of layers of lava and ash.
Shield volcanoes are formed when viscous magma piles up and hardens.
And Cinder cone
Cinder Cone volcanoes are formed by lava being erupted and turning into cylinders which harden together into a cone.