ˈvälkəˌnizəm noun
( -s )
Etymology: International Scientific Vocabulary volcano + -ism
: volcanic power or action : the quality or state of being volcanic
volcanism includes all phenomena connected with the movement of heated material from the interior to or toward the surface of the earth — P.G.Worcester
the craters on the moon appear to have been formed by meteoritic impact rather than volcanism — Journal of Geology