Plutons		Rock fragments classified by size that are thrown into the air during a volcanic eruption
Pyroclastic Flow		Swift-moving potentially deadly clouds of gas ash and other volcanic material produce by an eruption
Shield Volcano		Opening in Earth's crust through which lava erupts and flows out onto the surface
Sill		Irregularly shaped pluton that is similar to a batholith but smaller generally forms 10-30 km beneath Earth's surface
Stock		Broad volcano with gently sloping sides built by nonexplosive eruptions of basaltic lava
Tephra		Intrusive igneous rock bodies including batholiths stocks sills and dikes formed through mountain-building processes and oceanic collisions
Vent		Bowl-shaped depression in a volcano
Crater		Pluton that forms when magma intrudes parallel rock layers