Lava flows
Lava can flow a long distance, and will completely fill low areas it flows into
Lava up close
Don't try this in survival mode...
Crude Seismometer
Use this item to find the approximate distance to the nearest volcano
Cooling Basalt
Hot basalt in various stages of cooling
Mounding
Volcano during late "mounding" stage. Lava pressure causes blocks to push up on world surface.
Early eruption
Shortly after lava has broken through the top of the mound
Lava Bombs Launching at Night
You won't want to stand this close in Survival Mode...