vol·can·ism

[vol-kuh-niz-uhm]
noun Geology.
the phenomena connected with volcanoes and volcanic activity.
Also, vulcanism.


Origin:
1865–70; volcan(o) + -ism

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World English Dictionary
volcanism or vulcanism (ˈvɒlkəˌnɪzəm) [Click for IPA pronunciation guide]
 
n
those processes collectively that result in the formation of volcanoes and their products
 
vulcanism or vulcanism
 
n

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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00:10
Volcanism is always a great word to know.
So is flibbertigibbet. Does it mean:
the offspring of a zebra and a donkey.
a chattering or flighty, light-headed person.
Example sentences
Evidence for active volcanism in the past, but now geologically inactive.
In these setting you can develop bimodal volcanism where both basalt and
  rhyolite erupt.
Early speculation centered on sudden catastrophe, perhaps volcanism or an
  earthquake or a deadly hurricane.
The volcanic rift zones have features and lava flows that indicate they have
  been active through several cycles of volcanism.
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