adjective relating to or produced by or consisting of volcanoes.
adjective explosively unstable.
adjective igneous rock produced by eruption and solidified on or near the earth's surface.
Examples
“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.”