noun Geology.
the phenomena connected with volcanoes and volcanic activity.
Also, vulcanism.

1865–70; volcan(o) + -ism

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World English Dictionary
volcanism or vulcanism (ˈvɒlkəˌnɪzəm)
those processes collectively that result in the formation of volcanoes and their products
vulcanism or vulcanism

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Example sentences
Early speculation centered on sudden catastrophe, perhaps volcanism or an
  earthquake or a deadly hurricane.
Climate, volcanism, plate tectonics all played a key role in regulating the
  oxygen level during various time periods.
Volcanism has been the prime suspect, because lava flows can fill in and
  obscure craters.
In these setting you can develop bimodal volcanism where both basalt and
  rhyolite erupt.
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