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PREFERRED TERM
volcanic rocks  
BROADER CONCEPT
ENTRY TERMS
  • lava
  • pyroclastic
  • tuff
  • volcanic ash
SCOPE NOTE
  • A generally finely crystalline or glassy igneous rock resulting from volcanic action at or near the earth's surface, either ejected explosively or extruded as lava. The term includes near-surface intrusions that form a part of the volcanic structure.
URI
https://www2.usgs.gov/science/USGSThesaurus/volcanic%20rocks
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