Return to Geology Index PageInterior Structure of a Volcano
Even though there are at least three main types of volcanoes they have similar interior structures.
The Crater sometimes called the vent is the mouth of the volcano where the lava and gases escape during an eruption.
The Volcanic Neck or Shaft is the main conduit where magma rises through the volcano form the lower storage chamber.
The Sill is where magma cuts between layers of preexisting rock in the volcano.
A Dike is where magma cuts across layers of preexisting rock.
A Laccolith is a small magma storage chamber.
A Batholith is a large magma storage chamber