Definitions for "Volcanism"
The set of geological processes that result in the expulsion of lava, pyroclastics, and the volcanic venting effects associated with volcanoes: hot springs, smoking, and fumaroles. Synonym to vulcanism.
The processes by which magma and gases are transferred from Earth's interior to the surface.
The set of geological processes that result in the expulsion of lava, pyroclastics, and gases at the Earth's surface.
the phenomena associated with volcanic activity
the phenomena connected with volcanoes and volcanic activity. [AHDOS
Keywords:  force, activity
Volcanic force or activity.
Keywords:  action, power
Volcanic power or action; volcanicity.