volcanic

Adjective
  1. Relating to or produced by or consisting of volcanoes (synset 302837108)
    "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 (synset 302301492)
    "a volcanic temper"
    similar to: unstable - lacking stability or fixity or firmness
  3. Igneous rock produced by eruption and solidified on or near the earth's surface;
    Rhyolite or andesite or basalt (synset 301358594)
    "volcanic rock includes the volcanic glass obsidian"
    similar to: extrusive - of rock material; forced out while molten through cracks in the earth's surface

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