different between vulcanicity vs volcanic

English

vulcanicity (countable and uncountable, plural vulcanicities)

From French volcanique, from volcan (“volcano”); and/or directly from volcan(o) +? -ic.

volcanic (not comparable)

Of or pertaining to a volcano or volcanoes
volcanic heat.
volcanic activity.
Produced by a volcano, or, more generally, by igneous agencies
volcanic tufa
volcanic ash
Changed or affected by the heat of a volcano.
(figuratively) Reminiscent of a volcano; explosive, violent, full of suppressed anger, energy etc.
- 2009, Diarmaid MacCulloch, A History of Christianity, Penguin 2010, p. 556:
  With that the system was complete, and ready to have its disastrous effect on Martin Luther's volcanic temper.

volcanic (plural volcanics)

A volcanic rock.
The Ellesmere Island Volcanics are a Late Cretaceous volcanic group of volcanoes and lava flows in the Qikiqtaaluk Region of northern Ellesmere Island, Nunavut, Canada.

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