Strombolian eruption

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Close view of Stromboli Volcano erupting incandescent molten lava framgents.
Strombolian eruptions are characterized by the intermittent explosion or fountaining of basaltic lava from a single vent or crater. Each episode is caused by the release of volcanic gases, and they typically occur every few minutes or so, sometimes rhythmically and sometimes irregularly. The lava fragments generally consist of partially molten volcanic bombs that become rounded as they fly through the air.[1]

References

  1. http://volcanoes.usgs.gov/Products/Pglossary/strombolian.html