Viscosity		internal resistance to flow.
pluton		a mushroom-shaped pluton with a round top and flat bottom.
batholiths		the large plutons.
stock		irregularly shaped plutons that are similar to batholiths but smaller in size.
laccolith		an opening in the crust
sill		a pluton that cuts across preexisting rocks.
dike		a pluton that forms when magma intrudes parallel to layers of rocks.
vent		intrusive igneous rock bodies