Volcanic - Definition
volcanic
adj 1: relating to or produced by or consisting of volcanoes;
"volcanic steam"; "volcanic islands such as Iceland"; "a
volcanic cone is a conical mountain or hill built up of
material from volcanic eruptions"
2: explosively unstable; "a volcanic temper"
3: igneous rock produced by eruption and solidified on or near
the earth's surface; rhyolite or andesite or basalt;
"volcanic rock includes the volcanic glass obsidian"