volcanic

Adjective

• 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
    

• explosively unstable
  • a volcanic temper
    

• 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