"volcanic" in the adjective sense
relating to or produced by or consisting of volcanoes
"volcanic islands such as Iceland"
"a volcanic cone is a conical mountain or hill built up of material from volcanic eruptions"
"a volcanic temper"
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"
Source: WordNet® (An amazing lexical database of English)
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